hydroxyfunctional polyacrylic dispersion (MT-A-145)

IntroductionHydroxyfunctional polyacrylic dispersion MT-A-145 represents an advanced waterborne

Content

Introduction

Hydroxyfunctional polyacrylic dispersion MT-A-145 represents an advanced waterborne resin technology designed for environmentally friendly coating systems. This colloidal system combines the performance benefits of acrylic polyols with the sustainability advantages of water-based formulations.

1. Fundamental Properties

Table 1: Basic Physical Characteristics

Property	Specification	Test Method
Appearance	Milky white liquid	Visual inspection
Solid content	40±1%	ISO 3251
Hydroxyl value (mg KOH/g)	55±3	ASTM D4274
pH value	7.5-8.5	ISO 976
Viscosity (25°C, mPa·s)	100-500	Brookfield LV
Particle size (nm)	80-120	Dynamic light scattering

2. Curing Performance

Table 2: Crosslinking Characteristics

Parameter	With HDI trimer	With IPDI trimer	With Polyaziridine
Pot life (h)	6-8	8-10	4-6
Dust-free time (min)	45-60	60-90	30-45
Full cure (h)	72	96	48
Pendulum hardness (s)	120-140	140-160	100-120
MEK resistance (double rubs)	200+	200+	150+

3. Formulation Guidelines

Table 3: Typical Coating Formulations

Component	Wood Coating (%)	Industrial Coating (%)	Plastic Coating (%)
MT-A-145	60-70	50-60	40-50
Curing agent	8-12	6-10	5-8
Wetting agent	0.2-0.5	0.1-0.3	0.3-0.6
Defoamer	0.1-0.3	0.1-0.3	0.2-0.4
Thickener	0.5-1.0	0.3-0.8	0.8-1.2
Water	15-25	20-30	30-40

4. Performance Characteristics

Table 4: Cured Film Properties

Property	Test Method	Typical Value
Gloss (60°)	ASTM D523	≥85
Adhesion (cross-cut)	ISO 2409	0-1
Flexibility (conical mandrel)	ASTM D522	Pass 3.2mm
Impact resistance (direct)	ASTM D2794	50kg·cm
Water resistance (240h)	ISO 2812-2	No blistering
Weather resistance (QUV-B 500h)	ASTM G154	ΔE<2.0

Key Features

Excellent mechanical-chemical property balance
Low VOC content (<50g/L)
Good substrate wetting on various materials
Stable freeze-thaw resistance (5 cycles)
Compatible with most waterborne additives

Recommended Applications

Waterborne industrial wood coatings
Eco-friendly plastic coatings
Low-emission maintenance paints
High-performance DIY coatings
Agricultural equipment finishes

Processing Considerations

Optimal application viscosity: 60-90 sec (DIN4 cup)
Recommended curing: 30min@80°C or 7d@25°C
Storage stability: 12 months at 5-30°C
Film formation temperature: ≥15°C

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