Environmentally friendly polyurethane Drier _ Low Temperature fast drying without Heavy metals _ Alternative T-12 Organotin solution | RK-Chem| RK-Chem

Key words: Environmentally friendly polyurethane drier, alternative T-12 organotin, low temperature fast drying, no heavy metals, RK-Chem

First, the industry pain point: the environmental protection and efficiency bottleneck of traditional drying agents

Traditional polyurethane coatings rely on organotin catalysts (such as T-12, T-9), which can accelerate curing, but there are two core problems:

Toxicity risk: Organotin compounds have reproductive toxicity and environmental accumulation, and the EU REACH regulation has listed them as restricted substances;

Process defects: High temperature curing demand (≥25℃) leads to high energy consumption, and problems such as slow curing, bubbles, and bulges are prone to occur at low temperatures (<10℃) or high humidity environments.

It is estimated that coating enterprises using T-12 increase the cost of about 12-18% per year due to excessive VOC fines and equipment energy consumption losses.

2. RK-Chem solution: organic bismuth/zirconium composite catalytic system

rk-chem.com's environmentally friendly drier, based on bismuth (Bi) -Zirconium (Zr) co-catalytic technology, has achieved three major breakthroughs:

1. Non-toxic environmental protection, through international certification

Metal-organic compounds such as bismuth iso-octoate and zirconium neodecanoate are used, and toxic components such as lead, mercury and tin are completely discarded.

Through the EU REACH, Qualicoat Class II certification, VOC emissions are reduced by 90% compared with traditional processes.

2. Low temperature and quick drying to widen the construction window

At a low temperature of 5℃, the surface drying time is less than 20 minutes, which is more than 50% shorter than T-12;

The curing temperature range is extended to 5-45℃, suitable for winter construction and high latitude areas.

3. Inhibit side reactions and improve coating performance

Selectively catalyze the NCO-OH main reaction, reduce the side reaction between NCO and water, and avoid the formation of CO₂ bubbles;

The hardness of the paint film is increased by 2-5A, the water resistance is extended to 60 days without foaming, and the salt spray test is ≥1000 hours.

Comparison of measured data: double optimization of efficiency and cost

In the production line test of an automotive coating company in Guangdong, RK technology showed significant advantages:

Index improvement of RK environmental protection drier in traditional T-12 process

Curing temperature 25℃ 5-45℃ wide temperature range applicability +80%

Surface drying time (5℃) 45 minutes 18 minutes -60%

Film hardness (24h) 58A 63A +8.6%

VOC emission 120g/L ≤10g/ L-91.7%

Annual comprehensive cost ￥860,000 / thousand tons of paint ￥720,000 / thousand tons of paint -16.3%

Iv. Application scenarios and customer cases

Waterproof coating: two-component polyurethane waterproof material instead of T-12, curing efficiency increased by 30%, no bulge stripping problem;

Plastic track: through GB 36246-2018 TVOC test, the cost is 20% lower than that of bismuth zinc system;

Industrial anticorrosion: Matching epoxy resin system, salt spray resistance up to 1200 hours, has been applied to offshore wind electrical equipment coating.

V. Sustainable development and customer support

Circular economy: the bismuth/zirconium catalyst can be recycled and reused, and the heavy metal content of the production waste is < 1ppm;

Technical services: Provide full process support such as formula optimization, process debugging, certification declaration, etc.

Environmentally friendly polyurethane drier RT-3210