1、Preparation and flame retardancy of epoxy resin phosphoric acid

Therefore, the purpose of this paper is the preparation of flame-retardant PA resin modified by epoxy resin phosphorous acid (EPPA) and the study of its flame retardancy.

2、Modified Epoxy Resin Synthesis from Phosphorus—Containing

In this study, a phosphor-containing polyol was reacted with epoxy resin to provide a modified epoxy resin, PPME. Various amounts of PPME were blended with the mixture of DGEBA and D-230 to afford epoxy compositions.

3、Preparation and flame retardancy of epoxy resin phosphoric acid

Therefore, the purpose of this paper is the preparation of ame-retardant PA resin modi ed by epoxy resin phosphorous acid (EPPA) and the study of its fl fi ame retardancy.

4、Preparation and properties of epoxy resin modified with phosphorus and

Several formulations of modified epoxy resins (DIT-EPs) were obtained by adding different quantities of DITs. We found that when the flame retardant content reached 25%, the limiting oxygen index of the DIT-EP was 29.0%.

Phosphorous

In our previous research, we reported a polymerizable phosphorus-containing monomer—Hydroxyethyl methacrylate phosphate ester (HPN), which can polymerize with acrylic monomers by semi-continuous emulsion polymerization and then obtain a P-containing polyacrylic resin [1].

Preparation and flame retardancy of epoxy resin phosphoric

Therefore, the purpose of this paper is the preparation of flame-retardant PA resin modified by epoxy resin phosphorous acid (EPPA) and the study of its flame retardancy.

Preparation and properties of a phosphorus modified intrinsic flame

To address these challenges, a novel liquid reactive flame retardant (POG-PEPA) is synthesized from POG and PEPA and employed to create an intrinsically fire resistance EP in this work.

TECHNICAL DATA SHEET

PPI 14-7104 Modified Epoxy Resin Solution is an intermediate molecular weight epoxy resin modified by reaction with phosphoric acid and supplied at 55% NVM in 2-butoxyethanol.

An Itaconic Acid‐Based Phosphorus‐Containing Oligomer Endowing Epoxy

With the aim to reduce the influence of flammability and brittleness of epoxy resin (EP) on its applications, a phosphorus-containing oligomer (BID) containing phosphophenanthrene group and flexible chain segment is designed and applied to methyltetrahydrophthalic anhydride (MeTHPA) curing EP systems.

Preparation and flame retardancy of epoxy resin phosphoric acid

Therefore, the purpose of this paper is the preparation of flame-retardant PA resin modified by epoxy resin phosphorous acid (EPPA) and the study of its flame retardancy.

In the field of modern materials science, epoxy resin is widely favored for its excellent mechanical properties, chemical stability, and electrical insulating characteristics. these superior attributes often come with inherent weaknesses, such as brittleness, hygroscopicity, and poor heat resistance. To overcome these limitations, researchers have developed various modification methods, among which phosphoric acid-modified epoxy resin stands out as a promising solution.

Phosphoric acid-modified epoxy resin is a composite material that improves the performance of epoxy resin by introducing phosphate groups. This modification not only enhances the resin’s temperature resistance and chemical stability but also significantly improves its mechanical strength and toughness. The following sections will explore the aspects of phosphoric acid-modified epoxy resin in detail.

1. Principle of Phosphoric Acid Modification

Phosphoric acid-modified epoxy resin primarily involves a chemical reaction between phosphoric acid and the hydroxyl groups in epoxy resin molecules to form ester bonds, thereby incorporating phosphate groups into the epoxy resin structure. This process typically involves reactions with anhydrides or polyols, as follows:

• Reaction Process: First, an appropriate anhydride is selected as the curing agent and mixed with epoxy resin. The reaction between the anhydride and epoxy resin is then promoted by heating or adding a catalyst to form phosphate ester bonds. Finally, unreacted anhydride and other byproducts are removed through post-treatment to obtain the phosphoric acid-modified epoxy resin.
• Mechanism of Effect: The introduction of phosphate groups increases the polarity of the epoxy resin, enhancing its moisture resistance and reducing hygroscopicity. Additionally, the presence of phosphate groups improves thermal stability due to their relatively low decomposition temperature.

2. Advantages of Phosphoric Acid-Modified Epoxy Resin

The main advantages of phosphoric acid-modified epoxy resin include:

• Improved Temperature Resistance: The incorporation of phosphate groups allows the modified epoxy resin to maintain its physical and chemical stability at higher temperatures.
• Enhanced Mechanical Performance: The introduction of phosphate groups increases the toughness of the epoxy resin, making it suitable for applications requiring impact resistance.
• Improved Electrical Properties: The presence of phosphate groups helps enhance the dielectric strength and resistivity of the epoxy resin, making it an ideal choice for electronic encapsulation materials.

3. Application Fields

Due to its unique performance characteristics, phosphoric acid-modified epoxy resin has broad application prospects in multiple fields:

• Electronic Packaging: Owing to its excellent electrical properties and heat resistance, it can be used to manufacture high-performance electronic encapsulation materials, such as integrated circuit encapsulation.
• Aerospace: In the aerospace field, it can be used to manufacture components for high-temperature environments, such as rocket engine nozzles and casings.
• Construction Industry: In building materials, it can be used to produce waterproof coatings and adhesives, improving the weather resistance and durability of structures.

4. Challenges and Prospects

Despite its many advantages, phosphoric acid-modified epoxy resin still faces challenges in practical applications:

• Cost Issues: The production cost of phosphoric acid-modified epoxy resin is relatively high, which may affect its competitiveness in cost-sensitive markets.
• Environmental Impact: The introduction of phosphate groups may pose environmental risks, so developing low-toxicity or non-toxic phosphoric acid-modified epoxy resins is a future research direction.
• Technological Maturity: Although research has successfully developed and applied phosphoric acid-modified epoxy resin, further optimization of production processes is needed to improve its stability and reliability.

As an innovative material, phosphoric acid-modified epoxy resin improves the performance of epoxy resin by introducing phosphate groups, demonstrating significant application potential in multiple fields. With further research and technological advancements, phosphoric acid-modified epoxy resin is expected to play an increasingly important role in electronics, aerospace, construction, and other industries.