Common Application Issues of Solvent-Based Industrial Color Pastes
2026-02-05
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Common Application Issues of Solvent-Based Industrial Color Pastes
Solvent-based industrial color pastes are formulated by finely dispersing pigments, oil-based resins, and functional additives in organic solvents such as alcohols, esters, and ketones. In practical industrial coating applications, the quality, compatibility, and stability of color pastes play a critical role in determining the final appearance and protective performance of coatings—often just as important as resin selection or the main formulation itself.
To meet the diverse requirements of modern industrial coating systems, Kedi solvent-based industrial color pastes provide comprehensive and reliable color solutions across multiple industries and resin systems.
Common Resin Systems in Solvent-Based Industrial Coatings
Acrylic / Polyurethane Systems
Typical applications:Construction machinery, wind turbine blades, steel structures, vehicle topcoats (buses, trucks), outdoor facilities
Key performance requirements:
Excellent weather resistance and UV durability
Good compatibility and storage stability
Outstanding dispersion stability to ensure uniform color development and high gloss finish
Epoxy Systems
Typical applications:Ship ballast tanks, heavy-duty machinery primers, industrial flooring, chemical storage tank linings, anti-corrosion primers
Key performance requirements:
Excellent chemical resistance
Strong corrosion protection; color pastes must not contain electrolytes or impurities that compromise anti-corrosion performance
High compatibility with amine curing agents to avoid gelling, floating, or color separation
Fluorocarbon (PVDF) Systems
Typical applications:Landmark steel structures, high-end architectural curtain walls (aluminum panels, aluminum profiles), ultra-long-term corrosion protection projects (25+ years durability)
Key performance requirements:
Exceptional weather resistance matching the long service life of fluorocarbon resins
High thermal and baking resistance
Superior dispersion stability to ensure consistent color performance in high-durability resin systems
Chlorinated Rubber / Vinyl Systems
Typical applications:Marine coatings below the waterline, offshore facilities, port machinery, water- and chemical-resistant coatings
Key performance requirements:
Excellent water resistance and salt spray resistance
Good compatibility with fast-drying systems without affecting drying speed
Alkyd Systems
Typical applications:General machinery, factory fences, wrought iron products, standard metal hardware
Key performance requirements:
High color strength and decorative appearance
Relatively limited durability compared to advanced systems
Not suitable for long-term outdoor or humid environments
Cost-effective solution for general-purpose applications
Common Issues in Industrial Coating Applications
During the use of solvent-based industrial color pastes, most application problems are related to compatibility, dispersion stability, and processing performance. Below are the most frequently encountered issues and their underlying causes.
How to Improve Color Paste Universality and Compatibility
Due to the wide variety of resin systems used in solvent-based industrial coatings, incompatibility between color pastes and base resins—or significant differences in solvent polarity—can lead to problems such as floating, flooding, flocculation, and color separation.
Solution:Selecting a universal solvent-based color paste with broad resin compatibility is essential. Compatibility testing before large-scale production is strongly recommended to ensure formulation stability.
Uneven Color Appearance After Heavy Machinery Coating
Uneven color distribution in coated heavy machinery often occurs when pigment particles re-agglomerate after being added to the base paint. Once dispersion stability is disrupted, color strength decreases and gloss is negatively affected.
Solution:Use high-quality color pastes with excellent dispersion stability and finely controlled particle size to maintain consistent color performance.
Premature Fading and Chalking of Outdoor Steel Structures
Early fading, yellowing, or chalking of outdoor coatings is typically caused by the use of pigments with insufficient weather resistance rather than formulation or application errors.
Solution:For outdoor and long-term exposure applications, high-performance pigments (HPP) must be selected, such as:
Phthalocyanine pigments
Quinacridone pigments
Iron oxide pigments
These pigments ensure long-term color durability and weather resistance.
Low Color Matching Efficiency Causing Production Delays
As customized color requirements continue to increase, traditional manual color matching methods can no longer meet modern industrial demands for efficiency and consistency.
Solution:The industry is shifting from experience-based approaches to data-driven color management, including:
Color matching software
Spectrophotometers
Standardized formulation databases
Automated dosing and mixing systems
These tools significantly improve color accuracy and production efficiency.
Storage and Transportation Challenges of Solvent-Based Color Pastes
Many customers—especially those involved in overseas transportation—face challenges related to hazardous material storage and logistics for solvent-based products.
Solution:Kedi offers solid color chips and environmentally friendly, high-flash-point solvent-based industrial color pastes, helping customers reduce safety concerns during storage and transportation.
Conclusion
Solvent-based and water-based industrial color pastes are essential components of modern industrial coatings. By professionalizing and standardizing pigment dispersion, they provide coating manufacturers with efficient, flexible, and high-quality color solutions.
Choosing a color paste with excellent compatibility, stable quality, and reliable performance is a key factor in producing high-quality industrial coatings with consistent appearance and long-term durability.
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What Is Fruit Coating Wax?
2026-01-07
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Fruit coating wax (eg. WQ-W5169 and WQ-W5160 from wangqinresins) is a post-harvest treatment in which a thin layer of food-grade wax is applied to the surface of fresh fruits. The purpose is to protect the fruit, slow down moisture loss, and extend shelf life, while also improving appearance.
In nature, many fruits already have a natural wax layer on their skin. During commercial washing and cleaning, this natural wax is often removed. Fruit waxing simply replaces or enhances that lost protective layer.
Fruit waxing is commonly used for:
Apples
Citrus fruits (oranges, lemons, mandarins)
Pears
Avocados
Mangoes
What Is Fruit Wax Made Of?
Fruit wax is made from food-grade, edible ingredients, such as:
Carnauba wax (plant-based, from palm leaves)
Beeswax
Shellac (natural resin)
Food-grade paraffin wax (regulated)
Water-based emulsifiers and film-forming agents
All ingredients must comply with food safety regulations such as FDA (USA) or EFSA (EU).
Why Are Fruits Waxed?
Fruit waxing provides several important benefits:
1. Reduces Moisture Loss
Wax coatings slow dehydration, helping fruits stay firm and fresh longer.
2. Extends Shelf Life
By controlling respiration and oxidation, waxing delays ripening and spoilage.
3. Improves Appearance
Waxed fruits look shinier, smoother, and more appealing to consumers.
4. Protects During Transport
The coating offers mild protection against surface damage and microorganisms.
Are Waxed Fruits Safe to Eat?
Yes. Waxed fruits are safe to eat.
Fruit waxes are food-grade and edible
They are applied in very small amounts
They are strictly regulated by food safety authorities
Wax coatings do not change the taste of fruit when properly applied
Waxing has been used safely for decades worldwide.
Should You Wash Waxed Fruits?
Yes. Even though waxed fruits are safe:
Wash fruits under running water
Gently scrub firm fruits with a brush if desired
This removes surface dirt, residues, and part of the wax layer
Peeling is optional and based on personal preference, not safety necessity.
Common Myths About Fruit Waxing
❌ “Fruit wax is plastic”→ False. Fruit wax is made from natural or food-approved materials, not industrial plastics.
❌ “Waxed fruit is unhealthy”→ False. Waxed fruit remains nutritious and safe.
❌ “You shouldn’t eat the skin of waxed fruit”→ The skin is safe to eat, though washing is recommended.
Water-Based Fruit Wax: The Modern Standard
Most fruit waxes today are:
Water-based emulsions
Low odor
Environmentally friendly
Easy to apply and safe for consumers
One-Sentence Summary
Fruit waxing is a safe, food-approved process that protects fruits, improves appearance, and extends shelf life using edible wax coatings.
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What Is Heat Sealing?
2026-01-07
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What Is Heat Sealing?
And How Advanced Resins Enable Reliable Heat-Seal Coatings
Introduction
Heat sealing is a widely used bonding technology in the packaging and converting industries. It plays a critical role in applications such as food packaging, pharmaceutical blister packs, aluminum foil lids, labels, and laminated films. The performance of a heat-sealed package largely depends on the heat-seal coating and the resins used in its formulation.
Wangqin Resins provides a range of high-performance resins for heat-seal lacquers, including acrylic, polyurethane, and ternary chlorinated acetate resins, helping formulators achieve excellent seal strength, adhesion, and processing stability.
What Is Heat Sealing?
Heat sealing is a process in which two materials are bonded together by applying heat and pressure, sometimes for a short dwell time, allowing a thermoplastic layer to soften or melt and then fuse upon cooling.
In most packaging structures, heat sealing does not rely on mechanical fasteners or liquid adhesives. Instead, a heat-seal coating or resin layer becomes tacky at a specific temperature, forming a strong and durable bond once cooled.
How the Heat Sealing Process Works
HeatingThe heat-seal layer reaches its activation or melting temperature.
Pressure ApplicationThe two substrates (such as aluminum foil and plastic film) are pressed together.
Dwell TimeHeat and pressure are maintained for milliseconds to seconds.
Cooling and Bond FormationThe molten resin solidifies, creating a secure seal.
The quality of the seal depends on temperature, pressure, dwell time, and resin performance.
Common Heat Sealing Applications
Aluminum foil lids (Alu–PVC, Alu–PS, Alu–PET)
Flexible food packaging
Pharmaceutical blister packaging
Cigarette and tobacco packaging
Paper–plastic and foil–paper laminates
Medical and hygiene packaging
Each application requires specific resin properties, such as low seal initiation temperature, high seal strength, or food-contact compliance.
Key Properties Required for Heat-Seal Resins
An effective heat-seal resin should provide:
Low seal initiation temperature (SIT)
High and consistent seal strength
Good hot tack performance
Strong adhesion to multiple substrates
Thermal stability during processing
Compatibility with other resins and additives
This is where resin selection becomes critical.
Wangqin Resins Solutions for Heat-Seal Coatings
1. SA-24A Solid Acrylic Resin
Reliable adhesion and versatility
SA-24A is a thermoplastic acrylic resin widely used in heat-seal lacquers and printing applications.
Key advantages:
Excellent adhesion to aluminum foil and plastic films
Good film toughness and clarity
Easy solubility in ketones, esters, and aromatic solvents
Good compatibility with chlorinated resins and polyurethane resins
SA-24A is often used as a base resin in heat-seal coatings where balanced seal strength and processing stability are required.
2. WQ-PR888 Polyurethane Resin
Flexibility and enhanced seal strength
WQ-PR888 is a polyurethane resin designed to improve flexibility and bonding performance in heat-seal systems.
Key advantages:
Excellent flexibility and toughness
Improved adhesion to plastic substrates such as PVC, PET, and PS
Enhances hot tack and seal durability
Good compatibility with acrylic and chlorinated resins
When blended with acrylic resins like SA-24A, WQ-PR888 helps achieve strong, flexible, and reliable heat seals, especially in demanding packaging applications.
3. DA60 Ternary Chlorinated Acetate Resin
Outstanding metal adhesion and chemical resistance
DA60 is a ternary chlorinated acetate resin commonly used in aluminum foil heat-seal lacquers.
Key advantages:
Excellent adhesion to aluminum and metallized films
Good chemical resistance and thermal stability
Strong compatibility with acrylic and polyurethane resins
Suitable for complex multilayer packaging structures
DA60 is particularly effective in Alu-to-plastic heat-sealing systems, where high seal strength and resistance to storage or transportation conditions are required.
Synergistic Resin Systems for Heat Sealing
By combining:
SA-24A acrylic resin (adhesion and film formation),
WQ-PR888 polyurethane resin (flexibility and toughness),
DA60 ternary chlorinated acetate resin (metal adhesion and stability),
formulators can design high-performance heat-seal lacquers with:
Wide sealing windows
Strong and stable seal strength
Excellent substrate compatibility
Reliable performance in food and pharmaceutical packaging
Conclusion
Heat sealing is a critical technology that enables efficient, secure, and hygienic packaging. The success of heat sealing depends not only on equipment and process conditions, but also on the quality and compatibility of the resins used in heat-seal coatings.
With products such as SA-24A solid acrylic resin, WQ-PR888 polyurethane resin, and DA60 ternary chlorinated acetate resin, Wangqin Resins offers proven solutions for formulating reliable, high-performance heat-seal lacquers across a wide range of packaging applications.
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How to Select the Right Acrylic Resins for Coatings?
2025-12-08
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Selecting the right acrylic resin for a coating system depends on performance requirements, substrate, application method, environmental compliance, and cost. Below is a practical guide you can use for industrial, wood, metal, floor, plastic, and ink/varnish coatings.
How to Select the Right Acrylic Resins for Coatings
1. Define the End-Use Application
Different applications require different performance priorities:
Application
Key Properties to Look For
Industrial coatings
Chemical resistance, adhesion, durability, corrosion protection
Wood coatings
Flexibility, scratch resistance, gloss, clarity
Metal coatings
Adhesion, corrosion resistance, UV/weathering
Floor/Concrete coatings
Water resistance, abrasion resistance, hardness
Plastic coatings
Adhesion, flexibility, anti-blocking
Ink and varnishes
Pigment dispersion, high gloss, clarity, drying
2. Identify Required Resin Type
Acrylic resins come in different forms:
✔ Solution (solvent-based) Acrylic
High durability and gloss
Good adhesion to metal, plastic
Used in automotive, industrial coatings
Higher VOCs
✔ Emulsion (waterborne) Acrylic Resin
Environmentally friendly
Good stability and durability
Suitable for wood, metal, architectural
✔ Solid Acrylic Resin (Thermoplastic)
For 2K PU, NC coatings, inks, and varnish
Faster drying, high hardness, chemical resistance
✔ Styrene-Acrylic Copolymers
Cost-effective
Better water resistance and weathering
✔ Polyurethane-Modified Acrylic (PUA)
High flexibility and toughness
Improved scratch and chemical resistance
3. Match the Properties to Performance Needs
Key Resin Selection Parameters
Parameter
What It Affects
Glass Transition Temp (Tg)
Hardness, flexibility, blocking resistance
Molecular Weight
Film strength, gloss, flow
Acid Value
Solubility, pigment wetting
Functional Groups
Adhesion, crosslinking
Solubility
Compatibility with solvents/other resins
Hydrophobicity
Water resistance
4. Consider Formulating Requirements
A. Film Formation
Low Tg resins for flexible films (wood, plastic)
High Tg resins for hard films (floor, metal)
B. Gloss and Appearance
Solid acrylic resins → high gloss
Emulsion acrylic resin → adjustable (depends on particle size)
C. Pigment Dispersion
Choose acrylic with:
Proper acid value
Good compatibility
D. Chemical and Water Resistance
Promote:
Solid acrylic resin
PUA-modified acrylic
High hydrophobic resins
5. Environmental and Regulatory Considerations
Waterborne acrylic resins for low VOC and eco compliance
Avoid high residual monomers for food-contact or consumer use
UV curing acrylic resin for solvent-free systems
6. Application Method Matters
Method
Preferred Acrylic Resin Features
Spray
Good levelling, low viscosity
Roll/brush
Anti-foam, good open time
Dip/flow
Fast drying, stable flow
7. Cost vs. Performance Optimization
Pure acrylic resin → Best performance, highest cost
Styrene-acrylic resin→ Good balance of cost/performance
PUA-modified → Premium performance applications
8. Typical Selection Examples
✔ For Wood Coatings
Medium Tg acrylic + PUA modified acrylic resin
High clarity, resistance to scratch
✔ For Metal Coatings
High Tg acrylic resin
Good adhesion and weathering
✔ For Floor Coatings
Solid acrylic (thermoplastic) resin
High hardness + abrasion resistance
✔ For Printing Inks
Solid styrene-acrylic
Excellent pigment dispersion + gloss
Practical Checklist
Before finalizing your acrylic resin, confirm:
Can it form a continuous, defect-free film?
Does it adhere to the substrate reliably?
Is hardness vs flexibility balanced?
Is it compatible with pigments/additives?
Does it meet VOC/environmental limits?
Does it fit the budget?
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what is the wax coating on fruit ?
2025-10-22
What Is the Wax Coating on Fruit?
If you’ve ever picked up an apple or orange and noticed a shiny surface, you’ve likely encountered a wax coating. This thin, invisible layer is commonly applied to many types of fruits to help preserve their freshness, appearance, and shelf life. But what exactly is this wax coating, and why is it used?
Why Fruits Are Coated with Wax
After harvesting, many fruits such as apples, citrus fruits, pears, and cucumbers are washed to remove dirt and natural residues. This cleaning process also removes the fruit’s natural wax layer, which helps prevent moisture loss and spoilage. To replace it, producers apply a food-grade wax coating that serves several important functions:
Prevents moisture loss: Wax forms a barrier that slows down water evaporation, keeping fruits firm and juicy longer.
Reduces spoilage: The coating helps block oxygen and microorganisms that can cause decay.
Improves appearance: Wax adds a natural shine, making fruits more appealing to consumers.
Extends shelf life: By protecting against dehydration and mold growth, wax coatings help fruits stay fresh during transport and storage.
Types of Waxes Used on Fruits
Only food-safe waxes approved by food safety authorities (such as the FDA and EFSA) are used on edible products. Common types include:
Carnauba Wax: Derived from the leaves of the carnauba palm tree, it is one of the hardest natural waxes and provides a glossy finish.
Beeswax: A natural wax produced by honeybees; it offers a softer shine and is widely used on organic fruits.
Shellac: A natural resin secreted by the lac bug, used to give fruits a smooth and polished appearance.
Petroleum-Based Waxes (Microcrystalline or Paraffin Wax): These are refined food-grade waxes approved for limited use, often combined with natural waxes.
In some cases, these waxes are blended with resins, emulsifiers, or drying oils to improve coating uniformity and durability.
Is Wax on Fruit Safe to Eat?
Yes — the wax used on fruits is completely safe to eat. These coatings are applied in extremely thin layers (typically less than 0.2 grams per fruit) and are non-toxic and digestible. However, if consumers prefer, wax-coated fruits can be washed gently with warm water and a mild brush to remove most of the coating.
How to Identify Wax-Coated Fruits
Not all fruits are waxed, but you can often tell by:
A shiny, glossy surface that feels slightly slippery.
Uniform appearance even after long storage.
Fruits like apples, lemons, and cucumbers are more likely to be waxed, while berries, peaches, and grapes usually are not.
Conclusion
Wax coatings on fruits are a modern solution to age-old problems of spoilage and freshness. Made from natural or food-grade materials, these coatings help fruits look better, last longer, and stay fresher during transport and storage. So, the next time you see a glossy apple or orange, you can appreciate that the shine is not just for show — it’s a thin layer of protection keeping your fruit at its best.
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