The long-lasting effect and water-repellent property of makeup, sunscreen and hair care products are not satisfactory. They cannot be simply solved by increasing the proportion of oil or the amount of film-forming agents. One should first confirm the dissolution method, formulation compatibility, evaporation conditions and film-forming uniformity, and then determine whether the problem lies in insufficient resin dispersion, insufficient hydrophobicity after film formation, or insufficient adhesion between the film layer and the substrate. Tri-methyl-siloxyl-silicic acid ester 91002 can be considered as a candidate for long-term film formation and hydrophobic modification, but it must be confirmed through dissolution process, formulation compatibility and actual skin sensation tests.


Why is the film formation durability and hydrophobic effect of makeup, sunscreen or hair care products not as expected?


The tri-methyl-siloxyl-silicic acid ester powder failed to dissolve fully in non-aromatic organic solvents, resulting in a distinct film-forming particle sensation.


When mixed with volatile silicone oil or low-viscosity silicone oil, the dispersion was uneven, affecting the continuity and transparency of the film layer.


Other polar components in the formula have insufficient compatibility with the silicone resin, causing the film layer to become white or have a decrease in adhesion.


Although the hydrophobicity after film formation is good, the flexibility is insufficient, causing cracking or shedding when the skin moves or rubs.


Adding too much results in an overly hard film layer, affecting the skin-fitting and comfort of makeup.


During storage, if the container is not sealed, a small amount of residual solvent or oligomers volatilize, causing the resin to precipitate prematurely or form lumps.


The film-forming agent in the sunscreen formula fails to effectively fix the sunscreen agent, resulting in insufficient water-resistant washing performance.


Our company's public information indicates that tri-methyl-siloxyl-silicic acid ester is a typical representative of MQ resin, with excellent film-forming properties, hydrophobicity and moisturizing properties. However, its actual performance highly depends on the dissolution process, mixing conditions and formulation compatibility. Therefore, "adding MQ resin" itself cannot replace specific formulation and process verification.


First, determine at which stage the film formation or water resistance problem occurs.


Failure stage Possible causes Preferred inspection direction
Surface appears white particles or powder marks after coating Resin was not fully dissolved or dispersed unevenly Types of dissolution solvents, stirring temperature, mixing sequence
Insufficient water-resistant washing effect after film formation Insufficient adhesion of the film layer or insufficient hydrophobicity Amount of film-forming agent added, ratio of other silicone oils in the mixture
Short holding time or easy makeup removal of makeup products Insufficient hydrophobicity or anti-migration property of the film layer Compatibility of resin with pigment/oil phase, film layer continuity
Decreased SPF value or poor water resistance of sunscreen products Loss of sunscreen agent during water washing Resin's fixation ability for sunscreen agent, film layer density
Insufficient water-repellent effect of hair care products Uneven distribution of the film layer or discontinuous hydrophobic layer Revised addition amount, spraying process, hair surface condition
Skin sensation of stickiness or heaviness Excessive addition of film-forming agent or insufficient film layer flexibility Optimization of addition amount, ratio of other silicone oils in the mixture
Lumps or precipitation of the product after storage Improper sealing leading to solvent or oligomer volatilization Container sealing, storage temperature, usage period after opening
If only focusing on "whether the film-forming agent was added" without recording the dissolution method, mixing sequence and storage conditions, it is usually difficult to accurately determine whether it is a formulation problem or a process problem.


Why adding the film-forming agent dosage alone does not necessarily improve durability?


Tri-methyl-siloxyl-silicic acid ester 91002 needs to be dissolved in non-aromatic organic solvents before effective dispersion. Directly increasing the powder addition amount without optimizing the dissolution and dispersion process may result in uneven dispersion or film-forming defects.


When the addition amount exceeds the formulation compatibility limit, the film layer may become brittle, reducing the anti-friction and anti-migration performance.


If the dissolution solvent is improperly selected or the amount is insufficient, the resin cannot form a uniform solution, resulting in white spots or powder marks after film formation.


When mixed with volatile silicone oil, the volatilization rate does not match, causing the resin to precipitate prematurely.


The balance between hardness and flexibility after film formation needs to be adjusted based on specific application scenarios (such as frequent facial movement makeup).


After opening the lid and not sealing it in time, the powder may absorb moisture or volatile substances, affecting the subsequent dispersion effect.


Therefore, during optimization, one should also observe the dissolution state, the uniformity of blending, and the skin feel and durability of the film formed.


How does trimethylsilyloxy silicic acid ester compare with conventional film-forming modifiers?


Material direction Suitable key evaluation requirements Notices on boundaries
Trimethylsilyloxy silicic acid ester 91002 (MQ resin powder) Long-lasting hydrophobic film layer, anti-migration, water-resistant, enhanced sun protection durability Requires dissolving in non-aromatic organic solvents, pay attention to control of volatilization
Trimethylsilyloxy silicic acid ester and copolymer of pentasiloxane (liquid type) Convenient to use, direct addition, uniform film formation Need to pay attention to the risk of precipitation caused by volatilization of pentasiloxane
Polydimethylsiloxane alcohol (silicone gel) Slippery skin feel, soft film layer, filling fine lines Lower film formation strength, average anti-migration ability
Polymethylsilanediol (resin powder) Softening effect, oil-absorbing and oil-control Discontinuous film formation, not suitable for applications requiring complete coverage
Acrylic ester-based film-forming agents High gloss, strong setting Poor breathability, may affect skin feel or cause tightness
Our company's publicly available trimethylsilyloxy silicic acid ester 91002 is specifically used for long-lasting film formation and hydrophobic modification, and provides storage and usage recommendations for this specific product. This indicates that MQ resin powder can be used in cosmetic, sun protection, and hair care functional directions, but this product data cannot be directly transcribed as the guarantee range for other brands, formulas, or products.


Before selecting, it is necessary to confirm which formulations and process conditions?


Condition category Information to be confirmed
Formulation system Oil phase composition, volatile/non-volatile silicone oil type, pigment powder content, sunscreen type
Dissolution process Type of non-aromatic organic solvent, dissolution temperature, stirring time, resin to solvent ratio
Mixing conditions Order of mixing with volatile silicone oil or low-viscosity silicone oil, temperature control
Film formation requirements Hardness of film layer, flexibility, hydrophobicity, number of water-resistant washes, anti-migration ability
Application method Spraying, painting, squeezing, brushing, etc.
Skin feel target Clear, smooth, moisturizing, matte or glossy
Storage conditions Container sealing, storage temperature, expected usage period after opening
Failure manifestations White particles precipitation, film layer whitening, insufficient adhesion, short hold-up time, poor sun and water resistance
When the data is incomplete, it is not advisable to directly specify the addition amount of product 91002, the dissolution solvent, or the formulation ratio.


Which indicators should be verified for film formation and hydrophobic performance?


Verification items Primary function Not replaceable content
Solubility evaluation Confirm the complete dissolution of resin in non-aromatic organic solvents Static observation cannot replace the stability of blending
Film layer uniformity Judge whether the film is continuous and without particles Need to observe on a simulated substrate
Film layer hydrophobic angle Assess the waterproofing ability of the film layer Not replaceable by water-resistant or friction resistance tests
Anti-migration ability Assess the fixation ability of the film layer to pigment powder or sunscreen Need to be tested in combination with the actual contact medium
Water-resistant test Assess the durability (sun protection and water resistance, makeup hold-up) of the film layer Should use the actual formulation and simulated usage conditions
Skin feel evaluation Assess the softness, breathability, and skin-adhesion of the film layer Cannot be determined by laboratory data alone for consumer acceptance
Storage stability Observe whether the powder is damp or lumps Need to simulate the actual usage scenario after opening
How to design a control trial for long-lasting film formation and water resistance?


Use the same basic formulation (oil phase, pigment powder or sunscreen), only change the film-forming agent type or addition amount.


Set three groups: current use scheme, product 91002, and other film-forming agent candidate schemes.


Fix the type of dissolution solvent, mixing temperature and time.


Observe the film formation effect of freshly prepared, 1-month storage at room temperature, and 3-month storage after opening.
Test the hold-up time, water-wash resistance and sunscreen value changes on the skin or simulated substrate.


Compare the skin sensations (coolness, smoothness, stickiness) of each group of products.


Test the anti-wet performance of hair care products (hair retention time in high humidity environment).


Carry out multiple simulated usage cycles (such as application - rinsing - re-application), and do not just observe the film formation effect once.


Common misunderstandings


Tri-methylsiloxy silicic acid powder can be directly added to the formula
This product must first be dissolved in a non-aromatic organic solvent, then mixed with volatile silicone oil or low-viscosity silicone oil, direct addition will result in uneven dispersion.


The higher the addition amount, the longer the film layer lasts
If the addition amount is too high, the film layer may become too hard, cause a sticky sensation or produce white precipitates, it is necessary to balance the addition amount with the compatibility of the system.


A stable powder state does not mean it needs to be stored in a sealed manner
Opening the lid without sealing may lead to the volatilization of oligomers or moisture absorption, affecting the subsequent dissolution and film formation effect. It is recommended to use it as soon as possible and strictly seal it.


The film-forming agent can solve all hold-up or water-resistance problems
If the hold-up problem comes from poor dispersion of color powder, incompatible formula or unstable sunscreen agent, only relying on the film-forming agent may not be effective.


Only test standard glass plates, do not test the actual skin sensation
Glass plates are suitable for observing film formation, but the final effect still needs to be verified on the skin or hair strands for adhesion, comfort and durability.


Recommended selection steps


Confirm the formula system (oil phase composition, type of silicone oil, ratio of color powder or sunscreen agent)


Confirm the dissolution process (type of non-aromatic organic solvent, dissolution temperature, ratio of resin to solvent)


Confirm the blending conditions (mixing sequence with volatile silicone oil or low-viscosity silicone oil)


Clarify the film-forming target (water-resistance, anti-migration, long-lasting sunscreen, skin sensation requirements)


Compare product 91002 with other film-forming agent options.


Test the dissolution and film formation process under different temperatures and time conditions.


Verify the film formation durability, anti-migration and water resistance under simulated usage conditions.


Carry out an open lid simulated storage test to evaluate long-term stability.


Determine the final solution based on the results of multiple batches and actual skin sensation.


Our company, as a provider of organic silicone film-forming resins and personal care product raw materials, can assist in screening candidate directions related to tri-methylsiloxy silicic acid 91002 and related silicone oil systems. The specific plan should still be determined based on the formula system, film-forming requirements, processing conditions and skin sensation goals.


FAQ


Why does product 91002 need to be dissolved in a non-aromatic organic solvent first?
This product is a highly cross-linked solid resin powder. It cannot be evenly dispersed when directly added. It needs to be dissolved in a non-aromatic organic solvent (such as cyclopentasiloxane, isododecane, etc.) first, and then mixed with other components of the formula.


What is the difference between this product and the liquid MQ resin (such as 91003)?
91002 is a solid powder and needs to be dissolved before use. It is suitable for formulas that require flexible control of solvent type and concentration; 91003 is a pre-dispersed liquid, which is more convenient to use, but attention should be paid to the risk of precipitation caused by the evaporation of cyclopentasiloxane.


Can this product be used to increase the SPF value in sunscreen formulas?
This product forms a hydrophobic film layer to fix the sunscreen agent, improving the water-resistant performance of the sunscreen agent, thereby indirectly helping to maintain the SPF value. However, it does not directly increase the SPF. It needs to work in conjunction with the sunscreen agent.


Why does the product form lumps during storage?
After opening the lid and not sealing it, a small amount of oligomers may volatilize or the powder may absorb moisture, which may cause lumps. It should be stored tightly and it is recommended to use it as soon as possible after opening.


Does this product affect the skin adhesion of makeup?
The improved film-forming property may bring a certain sense of closure. By adjusting the addition amount (makeup recommended 2-10%) and combining it with other skin feel regulators, the balance between film-forming property and skin comfort can be achieved.