In response to the demand for water-based industrial paint color paste in the Shanghai area, particularly for alcohol-resistant color paste and pigments such as medium chrome yellow, lemon yellow, molybdenum chrome red, the following information is compiled for you, covering technical points, market recommendations, and precautions.

Key Technical Points of Alcohol-Resistant Dye Paste

1. Resin system selection

Recommended for use with water-based, water-based polyurethane, or epoxy-modified resins. They must be compatible with pigment paste, and upon curing, form a dense coating to resist erosion from aliphatic solvents.

Testing Method: After the pigment paste is formed into a lacquer film, observe the color change after wiping or rubbing (e.g., 500 back-and-forth strokes).

2. Chemical resistance of pigments

Mid-Chromium Yellow (PY34): Lead chromate containing, with excellent alcohol resistance but poor environmental friendliness, must comply with the GB 24409 2020 limit standards.

Lemon Yellow (PY3/PY74): Organic pigment, select high weather resistance type, with a weather resistance level of 5 or above.

III. Environmental Protection and Handling Precautions

1. Regulatory Compliance

Chrome Yellow Moth Chrome Red contains heavy metals, it must ensure compliance with China GB 24409 2020 (Building Coatings) and EU REACH regulations.

Alternative Solution: Lead-free chrome yellow pigments (such as PY53 as a substitute for mid-chrome yellow).

2. Construction Recommendations

pH Control: Water-based color paste pH should be maintained between 8 and 9 to avoid aggregation caused by acidic conditions.

Addition sequence: Color paste is added during the tinting stage, and low-speed stirring (<800 rpm) is used to prevent air bubbles.

Storage Conditions: Store in a sealed container at 5-30°C, prevent freezing and direct sunlight exposure.

Section 4: Common Issues Resolution

Dye Spreading/Flowering: Add 0.1% to 0.5% wetting agent (such as Tego Wet 270).

Insufficient alcohol resistance: Attempt to enhance the paint film's resistance to chemicals by using cross-linking agents (such as).

Color difference control for molybdenum chrome uses spectrophotometers (such as Xite) for batch calibration.

Red (For further testing or local supply samples, please contact Shanghai Coatings Research (phone: 021 6474xxxx) for technical coordination. It is recommended to prioritize suppliers that provide MSDS and environmental certifications to ensure compliance. PR104): Inorganic pigment, excellent alcohol resistance, but pay attention to heavy metal content.

3. Dispersant Matching

Choose a high molecular weight dispersant to ensure pigment stability and prevent flocculation caused by aliphatic solvents.