Product Overview
Runshine synthesis of polyester resin allows manufacturers to tailor the coating properties to meet specific application needs. Polyester resins constitute a cornerstone technology in the coatings industry, prized for their versatility, excellent mechanical properties, and ability to deliver high-quality finishes. These synthetic resins, formed through polycondensation reactions between polybasic acids and polyhydric alcohols, fall primarily into two distinct chemical categories with vastly different properties and applications: Saturated Polyester Resins (SPE) and Unsaturated Polyester Resins (UPR).
Understanding the fundamental chemistry, performance characteristics, and specific suitability of each type is crucial for formulators and applicators aiming to optimize coating performance across diverse substrates. This extensive guide delves deep into the world of saturated polyester binders and thermosetting unsaturated polyesters, exploring their unique attributes, dominant applications, and the underlying reasons for their effectiveness.For example, in the production of automotive coatings, a higher proportion of aromatic dicarboxylic acids can be used to increase the hardness of the saturated polyester, while in coatings for flexible plastic substrates, more long - chain diols can be incorporated to enhance flexibility.
| ─C─(CH2)4─C─O─(CH2)2─O─C─(CH2)4─C─O─(CH2)2─O |
Key Features
✧Exceptional Versatility: Polymeric esters (polyester resins) can be formulated to meet various performance needs, from high-gloss finishes to robust protective layers. Their molecular structure allows modifications during synthesis, enabling tailoring of properties like hardness, flexibility, and chemical resistance.
✧Strong Chemical Resistance: These ester-based polymers can withstand exposure to acids, alkalis, and solvents, making them ideal for industrial coatings. This resistance keeps coated surfaces intact and functional for long periods, reducing maintenance costs.
✧Excellent Adhesion: Polyester resins form strong bonds with substrates such as metal, wood, and plastic, preventing coatings from peeling or chipping easily. This is crucial for maintaining coating system integrity, especially under stress or movement.
✧High Durability: Coatings based on these resinous materials resist abrasion, impact, and weathering, suitable for both indoor and outdoor use. They provide long-lasting protection in automotive and architectural applications.
✧Aesthetic Versatility: They can deliver high-gloss, matte, or semi-gloss finishes, enhancing the visual appeal of coated surfaces. Popular in furniture manufacturing and automotive refinishing.
✧Ease of Processing: These ester polymers have good flow properties, enabling smooth application and uniform coverage. They can be applied via spraying, brushing, or dipping, fitting different production processes.
✧Flexible Curing: Polyester resins can cure through heat, UV, or ambient mechanisms, allowing optimization of production cycles and increasing efficiency based on application requirements.
✧Cost-Effectiveness: Compared to other high-performance resins, they offer a good balance between performance and cost, attractive for manufacturers controlling expenses without sacrificing quality.
|
Parameter
|
Typical Value
|
Unit
|
Notes
|
|
Appearance
|
Clear to pale yellow liquid
|
–
|
Visual inspection
|
|
Solid Content
|
40–100
|
%
|
Can be adjusted for formulation
|
|
Viscosity (25°C, Brookfield RV)
|
15000–25000
|
mPa·s
|
Spindle 3, 20 rpm
|
|
Hydroxyl Value
|
1.5–200
|
mg KOH/g
|
Determines reactivity with curing agent
|
|
Acid Value
|
≤16
|
mg KOH/g
|
Low acidity for stability
|
|
Density (25°C)
|
1.05–1.15
|
g/cm³
|
Typical value
|
|
Glass Transition Temperature (Tg)
|
-25–150
|
°C
|
Affects hardness and flexibility
|
|
Recommended Solvents
|
Xylene, Ethyl Acetate, Butyl Acetate，MEK etc
|
–
|
For formulation compatibility
|
|
Curing Method
|
With isocyanates or amino resins
|
–
|
2-pack polyurethane or industrial coatings
|
|
Shelf Life
|
12
|
months
|
Stored in sealed containers at 5–35°C
|
|
Storage
|
Cool, dry place
|
–
|
Avoid direct sunlight and moisture
|
| High molecular weight polyester resin |
| Product Name |
Solid Content(%) |
Tg(℃) |
Mn |
Visc. (cm3/g) |
Structure |
AV(Solids) OH |
Value(Solids) |
Solvent |
Properties Application |
|
| RHEPOL1828 |
40 |
47 |
15000 |
500-1500
mpa.s |
L |
2 |
5 |
S-100DBE |
high molecular weight saturated poluesterresin,compatiblity,flexibilityalloy. |
|
| RHEPOL 1830 |
40 |
67 |
15000 |
3200-4800
mpa.s |
L |
4 |
5 |
S-150/DBE |
high molecular weight saturated poluester resin,high Tg and good compatibility. |
|
| RHEPOL 1860 |
100 |
105 |
15000 |
55 |
L |
2 |
5 |
|
good sterilization resistance,high adhesion |
|
| RHEPOL1861 |
100 |
70 |
18000 |
56 |
L |
2 |
6 |
|
excellent flexibility and high hardness due toit's high Tg,good corrosion protection;co-
binder to improve blockingresistance |
| RHEPOL1867 |
100 |
65 |
20000 |
70 |
B |
6 |
6 |
|
Excellent flexibility,high hardness,good substrate adhesion and corrosion protection;
thinfilm primers |
|
| RHEPOL 1870 |
100 |
40 |
15000 |
64 |
L |
2 |
5 |
|
very flexible,high adhesion |
| RHEPOL1871 |
100 |
40 |
20000 |
64 |
B |
4 |
8 |
|
Good reactivity,flexible,high adhesion, suitable as elastifying component |
| RHEPOL1872 |
100 |
40 |
15000 |
62 |
L |
|
4 |
|
Highly flexible,high adhesion |
| RHEPOL1874 |
100 |
-23 |
|
97 |
|
|
|
|
opicdnisfalne povesiei fo themoplosic |
If need complete polyester resin brochure ,pls contact us
|
| Saturated Polyester Resins |
| Product Name |
Solid Content% |
Solvent |
Visc. |
Colour |
AV(Solids) |
OH Value(Solids) |
Properties Application |
| RHEPOL 1809 |
60 |
S100/
S100/XYL |
U-W |
≤2 |
≤10 |
|
Chemical resistance and water resistance,Automotive base coat,coloured coating and metallic base coatt |
| RHEPOL 1853 |
70 |
XYL |
|
≤3 |
≤7 |
80 |
Stone-chipping resistance,adhesion,Automotive mid coat,aluminium paint and industrial baking enamel |
| RHEPOL 1825 |
75 |
S150 |
00-2 |
≤3 |
≤8 |
25 |
Promote flexibility |
| RHEPOL 1835 |
100 |
|
3000-4000 |
|
00-2 |
156 |
Formulate two-component coating compounds.Mainly used on concrete and asphalt floors and steel surfaces.Coatinas are touiah and flexible. hard-wearing and chemical-resistant. |
| RHEPOL1839 |
55 |
MPA/S-100 |
2000-3000 |
|
Max.5 |
72 |
High Tg,Excellent chemical resistence. |
| RHEPOL 1840 |
65 |
S-150/BG |
1500-3500 |
|
Max.3 |
36 |
Excellent QUVresistance,Suitable for high
durable paint. |
| If need complete Saturated polyester resin brochure ,pls contact us |
| Unsaturated polyester resin |
| Product Name |
Solid Content % |
Solvent |
Visc. |
Acid Number |
Remarks |
Properties Application |
| RHEUPE 1841 |
65 |
Styrene |
550-700 |
≤15 |
Amine pre-
accelerated |
Non thixotropic resin for polyester putties |
| RHEUPE 1842 |
67 |
Styrene |
700-900 |
≤15 |
|
Resin addition for increasing elasticity |
| If need complete Unsaturated polyester resin brochure ,pls contact us |
Applications
Our Polyester Resin is suitable for a wide range of coating applications across automotive, industrial,wooden furniture and plastic substrates.
1. Automotive Coatings
✧ Polyester resins (polymeric esters): Serve as key components, offering a balance of performance and aesthetics. They contribute to the overall durability and visual appeal of automotive finishes.
✧ Saturated polyester (non-reactive polyester): Exhibits excellent chemical resistance, withstanding fuels, oils, and environmental pollutants. Its high gloss and color retention ensure the car's exterior remains vibrant for years. Also, it has good adhesion to metal substrates, preventing peeling even under harsh conditions.
✧ Unsaturated polyester (reactive polyester): Known for fast curing, reducing production time in automotive manufacturing. It provides a tough, impact-resistant layer, protecting the vehicle from minor dents and scratches. Cost-effective, making it suitable for mass-produced vehicles.
2. Industrial Coatings
✧Polyester resins (ester-based polymers): Form protective barriers against corrosion, abrasion, and extreme temperatures. Their versatility allows customization to meet specific machinery protection needs.
✧Saturated polyester (saturated polymeric esters): Boasts superior chemical resistance, ideal for machinery exposed to acids, alkalis, and solvents. Its high hardness ensures resistance to wear from moving parts. Maintains stability under high temperatures, suitable for machinery operating in hot environments.
✧Unsaturated polyester (unsaturated ester polymers): Offers high-build capability, forming thick coatings in one application to provide enhanced protection. Fast curing minimizes downtime during machinery maintenance. Cost-effective for large-scale industrial equipment coating.
3. Marine Coatings
✧Polyester resins (marine-grade polyester polymers): Protect marine structures from saltwater corrosion, fouling, and wave impact. They are designed to withstand harsh marine environments.
✧Saturated polyester (saturated marine polyesters): Exhibits excellent water resistance, preventing water penetration and corrosion. Resists the effects of UV radiation, maintaining its integrity under sunlight. Has good adhesion to metal and fiberglass substrates used in boats and marine structures.
✧Unsaturated polyester (unsaturated marine ester polymers): Offers high-build capability, forming thick coatings that act as a strong barrier against saltwater. Fast curing allows for quick application and repair of marine coatings. Compatible with fiberglass, commonly used in boat construction, ensuring a seamless finish.
3. Frniture Coatings
Polyester resins (resinous polyesters): Enhance the appearance and durability of furniture. They can be formulated to achieve various finishes, from high gloss to matte.
Saturated polyester (saturated resinous esters): Delivers a smooth, high-gloss finish that high lights the wood grain.Has good resistance to stains and scratches, keeping furniture looking new. Resists yellowing, maintaining the aesthetic appeal over time.
Unsaturated polyester (unsaturated resinous polyesters): Cures quickly, accelerating furniture production. Provides a hard, durable surface that withstands daily use. Cost-effective, making it a popular choice for mass-market furniture.
Benefits
✧ Strong Adhesion & Durability – Ensures coatings remain intact under mechanical stress, temperature changes, and environmental exposure.
✧ High Gloss & Surface Quality – Produces smooth, uniform films with excellent leveling and color retention.
✧ Chemical & Weather Resistance – Protects substrates from solvents, acids, alkalis, UV, and moisture.
✧ Flexible Formulation – Compatible with various crosslinkers, pigments, and additives for customized performance.
✧ Cost-Effective & Environmentally Considerate – Long-lasting coatings reduce maintenance and recoating needs, while VOC levels can be minimized for eco-friendly applications.
✧ Versatile Application Methods – Suitable for spraying, brushing, or rolling, adapting to different production and maintenance conditions.
Conclusions
Runshine Polyester resins, including saturated polyester and unsaturated polyester, are essential components in the coatings industry. Their unique characteristics and versatility make them suitable for a wide range of applications on different substrates, from metal and wood to plastic.Feel free to contact if any requirements on solvent based and water based resin and polymer
