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Synthesis Method of Polyester Acrylate Photocurable Resins

Release time:

2024-11-08 23:13

Synthesis Method of Polyester Acrylate Photocurable Resins
Synthesis Method of Polyester Acrylate Photocurable Resins

Polyester acrylate-based photocurable resins, as a class of high-performance photosensitive resins, have attracted considerable attention due to their unique synthesis methods, diverse structures, and wide range of applications. By ingeniously combining polyester polyols with acrylate monomers, these resins not only achieve dual optimization of structure and performance but also exhibit outstanding curing speeds, high cross-linking densities, and excellent physicochemical properties.

I. Synthesis Method

The synthesis methods for polyester acrylate-based UV-curable resins mainly include the direct esterification method, the prepolymer method, and the modified synthesis method.

1. Direct Esterification Method

This is a commonly used method for preparing acrylate compounds. In the direct esterification method, polyester polyols are directly esterified with acrylate monomers in the presence of a catalyst to produce polyester-acrylate photocurable resins. This method is simple to operate and features a fast reaction rate; however, the purity of the resulting product may be relatively low, necessitating subsequent purification steps. This method is suitable for preparing a wide variety of acrylate compounds, including saturated polyester acrylates and unsaturated polyester acrylates.

2. Prepolymer Method

The prepolymer method involves first preparing a polyester prepolymer and then reacting the prepolymer with acrylate monomers to produce polyester-acrylate-based UV-curable resins. This approach allows for precise control of the reaction process, thereby enhancing the purity and performance of the final product. Moreover, the presence of the prepolymer can increase the crosslinking density and curing speed of the resin.

3. Modified Synthesis Method

The modified synthesis method involves introducing other functional groups or additives into polyester acrylates to enhance certain properties of the original resin. This approach allows for tailoring the resin’s performance according to specific needs, thereby meeting the requirements of particular application scenarios. For example, by incorporating siloxane segments or fluorine elements, it is possible to produce modified polyester acrylates with outstanding weather resistance and hydrophobicity.

II. Specific Steps

1. Saturated polyester acrylate

The synthesis method for saturated polyester acrylates is primarily based on a polyesterification reaction followed by a subsequent acrylation reaction.

Polyesterification reaction: First, the polyester backbone is formed through the esterification reaction between polybasic acids and polyols. This step is typically carried out in the presence of a catalyst at an appropriate temperature.

Acrylation Reaction: Next, the hydroxyl groups on the polyester react with acrylic acid or its ester compounds, introducing acrylate groups into the polyester chain. This step also requires a catalyst, and reaction conditions must be carefully controlled to obtain the desired product.

2. Unsaturated Polyester Acrylate

The synthesis method for unsaturated polyester acrylates typically involves the following steps:

Preparation of polyester diols: Polyester diols containing C=C double bonds are prepared via esterification reactions between dicarboxylic acids and diols, or via ring-opening esterification reactions between unsaturated dicarboxylic acids and saturated dicarboxylic acids with ethylene oxide.

Acrylic end-capping: The polyester diol prepared above is reacted with acrylic acid, which end-caps the polyester diol, thereby yielding an unsaturated polyester acrylate.

3. Modified polyester acrylate

The synthesis methods for modified polyester acrylates can vary depending on the specific type of modification required and the desired performance characteristics. The following are several common synthesis methods:

(1) Esterification Grafting Method

Synthesis of Acrylic Prepolymers: An acrylic resin prepolymer containing a certain amount of carboxyl functional groups is synthesized via solution polymerization.

Synthesis of polyester prepolymers: A melt polycondensation method is employed to synthesize polyester resin prepolymers containing hydroxyl functional groups.

Esterification grafting reaction: Two prepolymers are grafted together to form a grafted copolymer through an esterification reaction between some of the carboxyl functional groups on the acrylic prepolymer and the hydroxyl functional groups on the polyester prepolymer.

This method can improve the compatibility issue between polyester and acrylic resin and endow the modified polyester acrylate with excellent performance.

(2) Direct Copolymerization Method

Raw Material Preparation: Prepare raw materials such as polybasic acids, polyols, acrylic acid, and its ester compounds.

Copolymerization reaction: In the presence of a catalyst, the raw materials are mixed and subjected to a copolymerization reaction to form a modified polyester acrylate.

This method is relatively simple to operate, but it may be necessary to pay attention to the proportions of the raw materials and the reaction conditions to ensure the performance of the product.

(3) Other modification methods

In addition to the two methods mentioned above, other modification approaches can also be employed to prepare modified polyester acrylates, such as introducing other functional monomers for copolymerization or using crosslinking agents. These methods can be adjusted and optimized according to specific application requirements and performance specifications.

III. Conclusion

In summary, there are various methods for synthesizing polyester acrylate-based UV-curable resins, each with its own unique advantages and suitable application scenarios. From the simple and straightforward direct esterification method to the pre-polymerization method, which enhances the purity and performance of the final product, and further to the modified synthesis approach that allows for tailored performance characteristics—these methods collectively form a comprehensive system for the preparation of polyester acrylate-based UV-curable resins. By carefully controlling the types and proportions of raw materials as well as reaction conditions, it is possible to produce resins with diverse properties and functionalities, thereby meeting the application requirements in multiple fields such as coatings, inks, and adhesives.

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