In scenarios such as high-temperature steam equipment, food packaging containers, or auto parts washing lines, coatings are subjected to repeated impacts of boiling water or high-temperature steam for a long time - blistering, shedding, and gloss loss have become common pain points in the industry. Traditional resins are prone to molecular chain breakage or interface adhesion attenuation under thermal stress, resulting in failure of the protective function. The T-7131 specialty resin developed by Shenzhen U-Sunny provides a reliable boiling water-resistant protective barrier for industrial coatings through a unique polymer structure design, while taking into account processing efficiency and environmental protection requirements.
1. The core challenge of boiling water resistant coating: balancing protection and process feasibility
Boiling water resistance refers to the ability of the coating to resist erosion by boiling water immersion. It needs to pass rigorous testing: immerse the sample in boiling distilled water to evaluate whether it has blistering, rust, loss of gloss or discoloration. This performance is crucial for products such as hot water equipment, kitchenware, packaging and printing, but it faces two major contradictions:
The game between thermal stability and flexibility: high cross-linking density can improve water resistance, but it will increase the brittleness of the coating and make it easy to crack under thermal shock;
The conflict between protection and construction efficiency: some water-resistant resins need to sacrifice curing speed or leveling, increasing the complexity of the production process.
二,Technological breakthrough of T-7131 resin: Molecular-level protection design
As a trifunctional aliphatic polyurethane acrylate, T-7131 achieves long-term protection in boiling water environment through the following key characteristics:
In-depth analysis of the mechanism of action:
Hydrophobic barrier construction: After the resin is cured, a dense network structure is formed. The hydrophobic groups in the molecular chain (such as long-chain alkanes) effectively block the penetration of water molecules and reduce the risk of coating swelling;
Interface anchoring enhancement: Polar groups (such as carboxyl groups) form chemical bonds with metal and glass substrates to maintain adhesion even under thermal stress;
Stress buffer design: The moderate flexibility of the molecular chain (Tg is about 25°C) absorbs the internal stress caused by thermal expansion and contraction to prevent cracking.
3. Practical verification: performance conversion from laboratory to production line
In the glass ink formula (Trust 7131 addition 35%), T-7131 shows its core value:
Printing adaptability: viscosity 4000–5500cps, no clogging when passing through 200–300 mesh screen, leveling of ink layer without pinholes;
Boiling water protection: after UV curing (1600mj energy), no shedding after boiling in boiling water for 60 minutes (5-level score), while maintaining 3H pencil hardness;
Process compatibility: when compounded with high-hardness resins (such as T-7133), it retains water resistance and avoids embrittlement, solving the contradiction of "water resistance but easy to collapse".
4. Industry application scenarios: Solving the pain points of "high temperature and high humidity" working conditions
T-7131 resin has replaced traditional solvent-based coatings in many fields, and typical scenarios include:
Food contact packaging: ink on the inner wall of cans, coating on fresh-keeping containers, which pass the boiling water sterilization test without failure;
Automotive parts: protective coating on metal parts around the engine, which can withstand high-pressure steam cleaning;
Electronic packaging: three-proof coating on PCB boards, which maintains insulation in high-humidity environments;
Industrial equipment: coating on the outer shell of heat exchangers, which resists condensation and periodic thermal shock.
5. Sustainable value: dual optimization of environmental protection and cost
The low viscosity of T-7131 resin (1600cps) allows the formulation to reduce the amount of diluent, and with high pigment carrying capacity (reducing the amount of base material by 15% compared to traditional resins), it significantly reduces VOC emissions. Its curing efficiency (medium-speed reaction) can shorten the production line working hours and comprehensively reduce the unit coating cost.
Explore how T-7131 can achieve breakthroughs in your products?
→ Visit Shenzhen U-Sunny official website to obtain technical white papers and test solutions
→ Contact the technical team to customize samples (support boiling water comparison experiment)