In the fields of car crystal coating, surface protection equipment, and high transparency anti-corrosion coatings, the coatings must not only meet the convenience of on-site room-temperature curing, but also achieve a hardness of 7H, a transmittance of over 95%, and a 0-level adhesion. At the same time, they need to adapt to the different requirements of different construction rhythms for the drying time of the surface. Traditional polysilazane products have a fixed drying time, making it difficult to balance the different process windows for large-scale construction and small-area fine work. The organic polysilazane 9150 has a main functional group of methyl, and the Si-NH-Si bond can undergo hydrolysis and oxidation curing at room temperature. The drying time can be customized according to customer requirements (such as 15-30min for type 8545 and 30-45min for type 8525), and the hardness after curing reaches 7H (24 hours at room temperature), the clear coat usage temperature is <300℃, and the formulation coating can be <1000℃. It can be used as a candidate base material for room-temperature curing high transparency protective coatings.


Why do polysilazane coatings that cure at room temperature often have uneven curing, cracking, or fail to meet the expected protective performance during construction or long-term use?


The mismatch between drying time and actual construction rhythm - different models (8545/8525) have different drying times, and are affected by environmental temperature and film thickness (at 25℃/60% humidity, 25μm film thickness dries in 20 minutes, 100μm film thickness dries in 28 minutes).


Insufficient complete curing conditions - room temperature curing requires more than 24 hours, and heating curing (drying after 60-200℃) can accelerate the process, but not doing so after drying may cause the coating to bubble.


The film thickness exceeds the resin cracking threshold (100μm+), and the coating cracks in a high-temperature environment or during the curing shrinkage process.


Improper selection of diluent - the product is miscible with most non-polar solvents (alkanes, ethers, ketones, esters), but alcohol ether solvents (such as diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, tetraethylene glycol butyl ether) should not be used.


Containers not sealed in time after use or inert gas replacement when using, and moisture in the air causes the resin to prematurely hydrolyze and deteriorate.


The coating usage temperature exceeds the recommended range - clear coat <300℃, formulation coating <1000℃, and the higher the film thickness, the more prone to cracking at high temperatures.


First, determine which stage the coating problem occurs.


Failure stage Possible causes Priority inspection direction
Mismatch between drying time and construction rhythm Unsatisfactory drying time not customized for the model Confirm 8545 (15-30min) or 8525 (30-45min) selection
Slow or non-curing during curing Insufficient humidity, low temperature, thick coating Environmental humidity/temperature, coating thickness control, heating curing conditions
Insufficient hardness after curing (<7H) Insufficient curing time or improper curing conditions Is the room temperature curing >24 hours, heating curing conditions
Coating cracking Membrane thickness exceeds 100μm threshold or heating too fast Coating thickness control, heating rate, usage temperature verification
Poor adhesion (grid method >0 level) Insufficient base material surface treatment or contamination Surface cleanliness, drying conditions
Shortened storage period or resin deterioration Resin enters the container or temperature control is improper Storage at 0-20℃, inert gas replacement, container sealing
Adaptation of drying time for different models of 9150 and application


Model 20-40℃, 10-100μm drying time Applicable scenarios Construction rhythm
IOTA 9150-8545 15-30min Automobile crystal coating, rapid construction High-efficiency assembly line, rapid delivery
IOTA 9150-8525 30-45min Equipment protection, fine construction Fine brushing, large-area spraying
Comparison reference of 9150 with 9108 and 9118


Comparison item 9150 9108 9118
Functional group Methyl as the main group 乙烯基 + Si-H 乙烯基
Hardness after curing 7H (24h) 6H 6-7H
Clear coat usage temperature <300℃ <600℃ <800℃
Drying time after surface application Customizable (15-45min) — —
Ceramic yield (at 800℃) Not indicated 40-60% 50-60%
What conditions need to be confirmed before selection and construction?


Condition category Required information
Application direction Automobile polishing, equipment anti-corrosion, non-flammable composite materials, polymer-based composite materials, glass and grinding tools
Base material type Metal, alloy, glass, paint film, PP/PC/PVC/PMMA and other plastics
Construction method Brushing, spraying, dipping, brushing
Required drying time Choose 8545 or 8525 model, or customize according to the construction rhythm
Curing conditions Room temperature curing (>24h) or heating curing (drying time after 60-200℃ × 2-5h)
Film thickness control Automobile polishing 3-8μm, equipment protection 10-15μm, recommended <100μm
Solvent diluent Alkanes, ethers, ketones, esters (strictly prohibit alcohol-ether)
Storage conditions 0-20℃, dry and cool, sealed, inert gas protection
Which key indicators should be verified?


Verification items Primary function Content that cannot be replaced
Drying time Verify the matching of the construction rhythm Affected by environmental temperature and film thickness
Curing hardness (7H) Verify the curing degree and scratch resistance Verify separately at room temperature 24h and heating curing
Transmittance (>95%) Verify optical transparency Test after curing
Adhesion (scratch test 0 grade) Verify the bonding force with the base material Verify on different base materials
Hydrophobic angle (100-105°) Assess the surface hydrophobic effect Test after curing
Temperature resistance (clear coat <300℃) Verify the upper limit of usage temperature Effect of film thickness on cracking temperature
Recommended construction scheme (example of automobile polishing)


Clean the surface of the automobile, ensuring no oil stains or dust, and the surface is dry.


Take IOTA 9150-8545 as an example, mix with the diluent at a ratio of 1:3-8 (adjust the solvent according to the working conditions), blow with high-purity argon/nitrogen after sealing.


Dip a clean non-woven fabric with the diluted polysilazane and apply evenly on the automobile surface (film thickness 3-8μm).


Let it stand for 30-60min (drying time) at room temperature.


Bake for 3h above 60-80℃ to ensure complete curing.


Recommended construction scheme (example of anti-corrosion coating)


Clean the surface of the radar and other equipment base materials.


Take IOTA 9150-8545 as an example, mix with the diluent at a ratio of 1:2-5, blow with inert gas after sealing.


Apply evenly on the base material surface (film thickness 10-15μm).


Let it stand for 60min (drying time) at room temperature.


Bake at 45℃ for 2h, 125℃ for 1h.


Common misunderstandings


All 9150 models have the same drying time: 9150-8545 dries in 15-30min at 20-40℃ and 10-100μm conditions, 8525 is 30-45min, choose according to the construction rhythm.


Drying time is only related to the model and not to the environment: the drying time of the same model changes with environmental temperature and film thickness, such as 25℃/60% humidity, 25μm film thickness dries in 20min, 100μm film thickness dries in 28min.


Room temperature curing for 24h has the same performance as heating curing: the hardness of room temperature curing can reach 7H, heating curing (drying time after 120-180℃ × 2-5h) can accelerate the curing process.


All solvents can be used for dilution: 9150 is insoluble in alcohol-ether type solvents (such as diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, tetraethylene glycol butyl ether).


After curing, it can be cleaned with ordinary solvents: Once 9150 is cured, it cannot be removed by ordinary solvents. Instead, it needs to be treated by immersing in a strong base such as 10% sodium hydroxide aqueous solution for more than 5 hours.


FAQ


Can the drying time of IOTA 9150 be customized?
OK. The drying time of this product can be customized according to customer requirements, such as 9150-8545 (15-30 minutes) and 9150-8525 (30-45 minutes). The drying time for specific models will vary depending on the environment and film thickness.


What hardness can be achieved after curing?
The hardness is 5H after 12 hours of room temperature curing, and it can reach 7H after 24 hours of room temperature curing.


What is the recommended application temperature for the clear coat coating?
<300℃ (related to film thickness, the higher the film thickness, the easier it cracks at high temperatures). The recommended application temperature for the formula coating is <1000℃.


Which substrates is this product suitable for?
It is suitable for metals, alloys, glass, paint films, and various plastic substrates such as PP, PC, PVC, PMMA, etc. The metal adhesion scratch test grade is 0.


How to clean after curing?
Once cured, ordinary solvents cannot be used to remove it. It can be treated by soaking in a strong alkali such as 10% sodium hydroxide water solution for more than 5 hours.


What are the typical application schemes?
Example 1: Automotive crystal coating (film thickness 3-8 μm, brushed/brushed, placed at room temperature for 30-60 minutes and then baked at 60-80℃ for more than 3 hours); Example 2: Anti-corrosion coating (film thickness 10-15 μm, sprayed/brushed, placed at room temperature for 60 minutes and then baked at 45℃ for 2 hours, 125℃ for 1 hour).