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Types and advantages and disadvantages of coating coupling agents
Release Date:
2025-10-17
1、 Titanium ester coupling agent
Representative products: GR-105 (monoalkoxy type), GR-201 (pyrophosphate type), GR-311W (water-based chelating type)
Applicable fillers: Calcium/barium based fillers (calcium carbonate, talc powder, barium sulfate, etc.)
Advantages:
Ø High filling cost reduction: Increase the amount of filler added and reduce the amount of resin used.
Improve processability: reduce system viscosity and shorten baking time.
Ø Enhanced toughness: Long chain alkyl winding resin molecules enhance impact resistance.
Disadvantages:
Poor heat resistance: prone to decomposition above 200 ℃, limiting the application of baking coatings.
Conflict with additives: ester exchange occurs with ester plasticizers, but does not react with petroleum derivative plasticizers.
2、 Silane coupling agent
Representative products: KH-550 (amino type), KH-560 (epoxy type), KH-570 (methacryloyloxy type), n-octyltriethoxysilane GR-SI351 (hydrophobic type)
Applicable fillers: Silicon containing fillers (white carbon black, quartz powder, glass fiber, etc.)
Advantages:
Strong interface adhesion: After hydrolysis, it binds with the hydroxyl groups of the filler, and the organic functional groups react with the resin, significantly improving adhesion and water resistance.
Excellent weather resistance: resistant to UV rays and moisture aging, especially suitable for exterior wall coatings.
Diverse functions: KH-550 enhances the bonding strength of epoxy/acrylic; GR-SI351 forms a hydrophobic layer and is used for waterproof coatings.
Disadvantages:
Ø Limited applicability: Poor effect on calcium based fillers such as calcium carbonate.
Ø Poor stability: prone to self condensation failure, requiring immediate preparation and use.
Ø Impact on appearance: Excessive use may cause the coating to fog up.
3、 Aluminum ester coupling agent
Advantages: Low cost, synergistic thermal stability effect on PVC, suitable for wood plastic materials.
Disadvantages: The coupling efficiency is lower than that of titanate/silane, and the application range is narrow.
4、 Comprehensive comparison and selection suggestions
（1）. Performance comparison:
Ø Titanate: Outstanding cost reduction and efficiency improvement (filling amount of 50%+), low cost, but poor heat resistance (<200 ℃).
Ø Silane: with the best adhesion and heat resistance>250 ℃, but high cost and limited applicability of fillers.
（2）. Selection principle:
Match by filling material:
Ø Alkaline filler (calcium carbonate) → acidic functional coupling agent (such as pyrophosphate titanate GR-201);
Ø Acidic filler (silica) → alkaline functional coupling agent (such as aminosilane KH-550).
Control dosage: Titanium ester 0.3-3%, silane dosage is about 0.1-1% of filler, excessive dosage will reduce performance.
Pre treated fillers: Mix with fillers before adding resin to avoid direct contact with other additives.
5、 Summary
Ø Silane: preferred for high weather resistance/high adhesion scenarios (such as building exterior walls, metal anti-corrosion coatings).
Ø Titanium esters: Priority given to high filling/cost reduction needs (such as plastic coatings, low-cost industrial paints).
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Room 4417, Huali Building, 67 Zhujiang Road, Xuanwu District, Nanjing
The company adheres to the business philosophy of "sincere and trustworthy, customer service, and win-win development". The products have won the trust of customers with excellent quality, sold throughout the country, and exported to Southeast Asia and European countries.
