Hydrophilic aliphatic polyisocyanate (MT 307/1)

IntroductionHydrophilic aliphatic polyisocyanate MT 307/1 is a water-dispersible crosslinking a

Content

Introduction

Hydrophilic aliphatic polyisocyanate MT 307/1 is a water-dispersible crosslinking agent specifically designed for aqueous coating systems. This modified polyisocyanate combines excellent weathering stability with enhanced water compatibility, making it particularly suitable for environmentally friendly coating formulations.

1. Fundamental Properties

Table 1: Basic Physical Characteristics

Property	Specification	Test Method
Appearance	Clear, pale yellow liquid	Visual inspection
NCO content (%)	12.5±0.5	ASTM D2572
Viscosity (25°C, mPa·s)	3000±500	Brookfield RV
Density (20°C, g/cm³)	1.10±0.02	ISO 2811
Flash point (°C)	>100	ISO 2719
Solubility in water	Dispersible	Manual evaluation

2. Compatibility and Reactivity

Table 2: Compatibility with Common Resin Systems

Resin Type	Compatibility	Pot Life (h, 25°C)	Recommended NCO:OH Ratio
Acrylic polyol dispersion	Excellent	4-6	1.2-1.5:1
Polyester polyol dispersion	Good	3-5	1.3-1.6:1
Polyurethane dispersion	Excellent	5-7	1.1-1.4:1
Alkyd emulsion	Limited	2-3	1.5-1.8:1

3. Formulation Guidelines

Table 3: Typical Coating Formulations

Component	Wood Coating (%)	Industrial Coating (%)	Automotive Refinish (%)
Hydroxyl component	60-70	55-65	50-60
MT 307/1	10-15	8-12	12-18
Co-solvent	3-5	2-4	4-6
Additives	1-2	1-2	1-2
Water	15-25	20-30	20-25

4. Performance Characteristics

Table 4: Cured Film Properties

Property	Test Method	Typical Value
Pendulum hardness (s)	ISO 1522	120-150
Cross-cut adhesion	ISO 2409	0-1
Flexibility (conical mandrel)	ASTM D522	Pass 4mm
MEK resistance (double rubs)	ASTM D5402	>200
Water resistance (240h)	ISO 2812-2	No change
Weather resistance (QUV-B 1000h)	ASTM G154	ΔE<2.5

Key Features

Excellent water dispersibility without emulsifiers

Low viscosity for easy processing

Superior yellowing resistance

Good mechanical-chemical property balance

Compatible with various aqueous resin systems

Recommended Applications

Waterborne wood coatings

Eco-friendly industrial finishes

Automotive refinish systems

Plastic coatings

High-performance DIY coatings

Processing Considerations

Optimal application temperature: 15-30°C

Recommended curing: 30min@80°C or 7d@25°C

Storage stability: 6 months in original container

Requires mechanical stirring for water dispersion

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