1、Utilization of liquid epoxidized natural rubber as prepolymer and

In addition to glycerol, LENR50 was introduced as bio-based polyol for the alkyd synthesis. The rubber prepolymer was chemically integrated into the alkyd chain via the reaction between its epoxide or hydroxyl groups with COOH of diacids during polycondensation.

2、Alkyd resin

Alkyd resin, a complex oil-modified polyester that serves as the film-forming agent in some paints and clear coatings. Developed in the 1920s, alkyd-based enamel paints were once one of the most important types of surface coating.

3、Alkyd Resin Synthesis

An alkyd is a polyester resin commonly derived from fatty acids, polyhydric alcohol, and dibasic acids, which has many applications in the coatings industry due to its low cost, broad functionality, and production from renewable seed oils. Alkyd is a term to describe special types of polyester resins that are modified with monobasic fatty acids.

alkyd

alkyd（英式发音 [ˈælkɪd]、美式发音 [ˈælkɪd]）是英语名词，对应中文“ 醇酸树脂 ”，指由多元醇与酸酐缩聚形成的改性聚酯类合成聚合物。 其主要原料包括 邻苯二甲酸酐 、 甘油 等，可通过添加 氨基树脂 或 脂肪酸 改性调整性能，广泛应用于涂料、油漆及树脂制造领域，典型制品有 醇酸清漆 、磁瓷漆、耐油漆等 [1-4] [8]。 该物质早期通过油脂水解产物（如菜籽油衍生的十八烯酸）进行物理改性，后发展出 苯乙烯 、 丙烯酸 及 氨基甲酸酯 等化学改性工艺，形成长油度、中油度等细分类型 [5] [7]。 20世纪以来，其制备技术结合相转化乳化法、高温烘烤交联固化等工艺，进一步扩展至硝化纤维素乳液、塑料及复合材料领域 [2] [6]。

What is an alkyd resin ?

Created from a polycondensation reaction between polyhydric alcohols and dibasic acids, alkyd resin is subsequently modified with oil or fatty acids. While the term “alkyd” comes from “alcohol” and “anhydride”, it is the “polyester” part in alkyd resin which gives the resin its rigid properties.

What is Alkyd Resins? Everything about resins

Alkyd resins are synthetic polymers used predominantly in the production of high-quality paints and coatings. Derived from the polycondensation reaction of polyhydric alcohols, polybasic acids, and fatty acids, alkyd resins boast unparalleled versatility.

Prepolymer – Knowledge and References – Taylor & Francis

This resin is called the prepolymer, and it normally has a low molecular weight. In the second stage, the prepolymer is formed into the final shape in a mold. Polymerization, or curing, takes place when heat and/or pressure and/or catalysts are added to the prepolymer. Published in Chemical Engineering Communications, 2019.

Alkyd Resins

Generally, alkyd resins are low molecular weight polymers with the molecular weight between 2000–10,000 gmol −1. These resins contain unreacted acids and hydroxyl groups in their backbone (as presented in Scheme 3), which can react with other molecules or oxygen to form the solid binder.

5 ALKYD RESIN TECHNOLOGY

These resins may be copolymerized across available hydroxyllinkages to yield alkyd resins of markedly superior general durability and gloss retention, particularly with mid-tones and darker colours.

Alkyd Resin Synthesis

An alkyd is a polyester resin commonly derived from fatty acids, polyhydric alcohol, and dibasic acids, which has many applications in the coatings industry due to its low cost, broad functionality, and production from renewable seed oils. Alkyd is a term to describe special types of polyester resins that are modified with monobasic fatty acids.

In the coatings and adhesives industries, alkyd resins play a pivotal role. These resins are high-molecular-weight compounds formed through condensation reactions between polyols and aliphatic carboxylic acids. Their structure dictates their properties and application range. Understanding the composition, characteristics, and uses of alkyd resins is not only essential for grasping the fundamental science of this material but also critical for guiding practical applications.

The primary components of alkyd resins are polyols and aliphatic carboxylic acids. Polyols, such as glycerol and trimethylolethane, serve as the foundational units for forming the resin’s network structure. Aliphatic carboxylic acids, including phthalic anhydride, sebacic acid, and maleic acid, provide the necessary chemical bonds and physical crosslinking sites. During synthesis, precise control over parameters like the polyol-to-acid ratio, reaction temperature, time, and catalyst usage allows for fine-tuning of the resin’s properties, such as softening point, thermal resistance, flexibility, and mechanical strength.

From a chemical perspective, the formation of alkyd resins involves complex reactions. Polyols and aliphatic carboxylic acids first undergo esterification to produce intermediate products containing ester linkages. These intermediates then condense with remaining polyols or acids to form longer polymer chains. This condensation reaction typically requires heating to promote molecular collisions and bonding, resulting in a dense three-dimensional network structure. As the reaction progresses, the resin’s viscosity increases until it reaches a curing point, where it hardens and exhibits the desired physical and chemical properties.

The characteristics of alkyd resins determine their applications across diverse fields. Due to their excellent thermal stability and chemical inertness, they are widely used in high-temperature coatings and adhesives. For example, amino-alkyd resins in automotive paints leverage their superior heat resistance and corrosion protection to meet the demands of long-term outdoor exposure. Additionally, their strong adhesion and flexibility make alkyd resins ideal for coating fabrics, paper, and wood. In construction, they are employed in waterproof coatings and sealants to shield materials from moisture and UV damage.

Despite their broad applicability, alkyd resins face challenges in production. Their high Volatile Organic Compound (VOC) content necessitates strict emission controls to minimize environmental and health impacts. With rising eco-standards, developing low-VOC or VOC-free alkyd resins has become a key industry goal. Concurrently, research into novel catalysts and synthetic processes to enhance resin performance remains a hot topic.

alkyd resins are high-molecular-weight compounds synthesized via condensation reactions between polyols and aliphatic carboxylic acids. Their unique chemistry and properties render them indispensable in coatings and adhesives. A deep understanding of their composition, characteristics, and applications not only strengthens foundational knowledge but also guides practical innovation. Addressing future challenges and opportunities will rely on sustained research and development to drive the alkyd resin industry forward.