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hydroxyfunctional polyacrylic dispersion (MT-A-145)

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

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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

PropertySpecifikationTest Method
UtseendeMilky white liquidVisual inspection
Solid content40±1%ISO 3251
Hydroxyl value (mg KOH/g)55±3ASTM D4274
pH value7.5-8.5ISO 976
Viscosity (25°C, mPa·s)100-500Brookfield LV
Particle size (nm)80-120Dynamic light scattering


2. Curing Performance

Table 2: Crosslinking Characteristics

ParameterWith HDI trimerWith IPDI trimerWith Polyaziridine
Pot life (h)6-88-104-6
Dust-free time (min)45-6060-9030-45
Full cure (h)729648
Pendulum hardness (s)120-140140-160100-120
MEK resistance (double rubs)200+200+150+


3. Formulation Guidelines

Table 3: Typical Coating Formulations

ComponentWood Coating (%)Industrial Coating (%)Plastic Coating (%)
MT-A-14560-7050-6040-50
Curing agent8-126-105-8
Wetting agent0.2-0.50.1-0.30.3-0.6
Defoamer0.1-0.30.1-0.30.2-0.4
Thickener0.5-1.00.3-0.80.8-1.2
Water15-2520-3030-40


4. Performance Characteristics

Table 4: Cured Film Properties

PropertyTest MethodTypical Value
Gloss (60°)ASTM D523≥85
Adhesion (cross-cut)ISO 24090-1
Flexibility (conical mandrel)ASTM D522Pass 3.2mm
Impact resistance (direct)ASTM D279450kg·cm
Water resistance (240h)ISO 2812-2No blistering
Weather resistance (QUV-B 500h)ASTM G154ΔE<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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