Advantages of polyurethane catalyst 9727 in the molding of complex shape products

Introduction

Polyurethane (PU) is an important polymer material, and has been widely used in many fields due to its excellent mechanical properties, chemical resistance, wear resistance and elastic properties. Polyurethane products not only occupy an important position in the construction, automobile, furniture and other industries, but also show great potential in the fields of aerospace, medical equipment and other fields. With the continuous growth of market demand and technological advancement, the application scope of polyurethane is also expanding, especially in the molding process of complex shape products, the requirements for catalysts are becoming increasingly high.

Catalytics play a crucial role in the synthesis of polyurethane. It can accelerate reaction rate, shorten curing time, improve production efficiency, and have a direct impact on the performance of the final product. Although traditional polyurethane catalysts such as tertiary amines and organotin perform well in some applications, there are often some limitations in the molding process of complex-shaped products, such as the rapid reaction speed leading to bubble generation and poor surface quality. , difficulty in demoulding, etc. Therefore, the development of new efficient and stable polyurethane catalysts has become the focus of research.

9727 Catalyst As a new type of polyurethane catalyst, it has attracted widespread attention in recent years. It is a product jointly developed by many internationally renowned chemical companies, with unique molecular structure and excellent catalytic properties. Compared with traditional catalysts, the 9727 catalyst has shown significant advantages in the molding process of complex-shaped products. It can ensure product quality while greatly improving production efficiency and reducing production costs. This article will discuss the advantages of 9727 catalyst in the molding of complex shape products in detail, combine domestic and foreign literature to analyze its performance in different application scenarios, and further verify its superiority by comparing experimental data.

9727 Basic parameters of catalyst

9727 Catalyst is a highly efficient catalyst specially designed for polyurethane systems. Its chemical name is Bis(dimethylaminoethoxy)ethyl ether (DMDEE), referred to as DMDEE for short. This catalyst belongs to a tertiary amine catalyst, has high activity and selectivity, and can effectively promote the reaction between isocyanate and polyol at a lower dosage. The following are the main physical and chemical parameters of the 9727 catalyst:

From the table above, it can be seen that the 9727 catalyst has good physical and chemical stability and is suitable for use in a wide range of temperatures. Its low viscosity and high water solubility make it easy to mix in polyurethane formulations and can be evenly dispersed in the reaction system, thus ensuring efficient use of the catalyst. In addition, the 9727 catalyst has a higher boiling point and a relatively high flash point, which makes it have better safety during processing and reduces the risks of volatile and flammable.

9727 Mechanism of action of catalyst

9727 Catalyst As a tertiary amine catalyst, its main function is to accelerate both by providing electrons to the reaction site between isocyanate (Isocyanate, -NCO) and polyol (Polyol, -OH). Reaction rate. Specifically, the molecular structure of the 9727 catalyst contains two dimethylaminoethoxy groups (-OCH2CH2N(CH3)2), which are capable of forming hydrogen bonds or π-π interactions with the -NCO group in isocyanate. Reduce its reaction activation energy, thereby making the reaction more likely to occur.

1. Reaction of isocyanate and polyol

In the synthesis of polyurethane, the reaction of isocyanate and polyol is a critical step. This reaction can be divided intoFor the following stages:

1. Initial Contact Stage: Isocyanates and polyols first contact the catalyst molecules through diffusion. Because the 9727 catalyst has high solubility and dispersion, it can quickly contact the reactants and form active intermediates.

2. Formation of active intermediates: The dimethylaminoethoxy functional group in the 9727 catalyst interacts with the -NCO group in the isocyanate to form an unstable active intermediate. This intermediate has a low reaction activation energy and can react quickly with other reactants.

3. Reaction proceeds: The active intermediate reacts with the -OH group in the polyol to form an urea group (-NH-CO-O-) or a carbamate group (-NH- CO-NH-). This process is a gradual polymerization process. As the reaction progresses, the molecular chains gradually extend, and eventually form polyurethane macromolecules.

4. Termination stage: When the reaction reaches a certain level, the action of the catalyst gradually weakens, the reaction rate slows down, and finally a stable polyurethane network structure is formed.

2. Selectivity of 9727 Catalyst

In addition to accelerating the reaction of isocyanate with polyol, the 9727 catalyst also exhibits certain selectivity. Studies have shown that the 9727 catalyst has a strong inhibitory effect on the side reaction between isocyanate and water (i.e. foaming reaction). This is because under the action of the 9727 catalyst, isocyanate preferentially reacts with polyols rather than side reactions with water to produce carbon dioxide. This selectivity helps reduce bubbles and pores in the product and improves the compactness and surface quality of the product.

3. Synergistic effects of 9727 catalyst

In practical applications, the 9727 catalyst is usually used in conjunction with other types of catalysts, such as organotin catalysts, to further optimize reaction conditions. For example, when 9727 catalyst is combined with dibutyltin dilaurate (DBTDL), the reaction rate can be significantly improved while maintaining good selectivity. This is because the 9727 catalyst can promote the main reaction between isocyanate and polyol, while DBTDL can accelerate the side reaction between isocyanate and water. The two complement each other and achieve the best catalytic effect.

The Advantages of 9727 Catalysts in the Forming of Complex Shape Products

In the molding process of complex-shaped products, polyurethane materials need to have good fluidity and rapid curing capabilities to ensure the dimensional accuracy and surface quality of the products. Traditional polyurethane catalysts often find it difficult to meet these requirements, especially in the complex mold design and uneven wall thickness.In the case of this, bubbles, cracks, and difficulties in demolding are prone to occur. With its unique molecular structure and excellent catalytic properties, the 9727 catalyst has shown significant advantages in the molding of complex-shaped products.

1. Rapid curing and high fluidity

9727 catalyst has high activity and can complete the curing process of polyurethane in a short time. Studies have shown that the polyurethane system using 9727 catalyst can cure within 10-15 minutes, which shortens the curing time by about 30%-50% compared to traditional catalysts. This is especially important for the molding of products with complex shapes, as long curing times may cause uneven flow of materials in the mold, which in turn affects the dimensional accuracy and surface quality of the product.

In addition, the 9727 catalyst can effectively improve the flowability of polyurethane materials and make them fully filled in complex molds. Especially during the molding process of thin-walled or elongated structures, the high flowability of the 9727 catalyst can ensure that the material can enter every corner of the mold smoothly, avoiding hollows or material shortages. According to a foreign study (Smith et al., 2018), the filling rate of polyurethane materials using 9727 catalyst in complex molds was increased by about 20%, and the surface smoothness of the articles was significantly improved.

2. Reduce bubbles and pores

In the molding process of complex shape products, bubbles and pores are one of the common defects. These defects not only affect the appearance quality of the product, but also reduce its mechanical properties. The 9727 catalyst effectively reduces the generation of bubbles by inhibiting the side reaction between isocyanate and water. Studies have shown that in polyurethane products using 9727 catalyst, the number of bubbles decreased by about 50% and the porosity decreased by about 30% (Wang et al., 2019). This is mainly because the 9727 catalyst can preferentially promote the main reaction between isocyanate and polyol, thereby reducing the formation of carbon dioxide.

In addition, the 9727 catalyst has good dispersion and can be evenly distributed in the reaction system to avoid excessive local reactions leading to bubble aggregation. This is especially important for complex shape products, as complex mold designs tend to aggravate bubble formation and aggregation. By using 9727 catalyst, the compactness of the product can be significantly improved, and its mechanical strength and durability can be enhanced.

3. Improve surface quality and mold release performance

The surface quality of products with complex shapes directly affects their appearance and performance. The 9727 catalyst can effectively improve the surface quality of the product by adjusting the reaction rate and selectivity. Specifically, the 9727 catalyst can uniformly cure the polyurethane material in the mold to avoid defects such as depressions and cracks on the surface. In addition, the 9727 catalyst can also improve the flexibility of polyurethane materials, making them less likely to be damaged during the demolding process, thereby ensuring the integrity and aesthetics of the product.

Model release performance is also an important factor in the molding of complex shape products. By adjusting the reaction rate, the 9727 catalyst can quickly cure the polyurethane material in the mold and shorten the demolding time. According to a domestic study (Li et al., 2020), polyurethane products using 9727 catalysts exhibit better flexibility and anti-stickness during the release process, with a reduction in release time of about 20%, and the surface of the product is not available Significant scratches or damage.

4. Improve production efficiency and reduce costs

9727 The application of catalyst in the molding of complex shape products can not only improve product quality, but also significantly improve production efficiency and reduce production costs. First, the rapid curing characteristics of the 9727 catalyst greatly shortens the entire production cycle, reducing mold occupancy time and energy consumption. Secondly, the high selectivity of the 9727 catalyst and its ability to inhibit bubble generation reduce waste rate and reduce waste of raw materials. Later, the excellent dispersion and stability of the 9727 catalyst makes it unnecessary to frequently adjust the formula or replace the equipment during the production process, further reducing the production cost.

Domestic and foreign application cases and research results

Since its introduction, the 9727 catalyst has been widely used in many countries and regions and has achieved remarkable results. The following are some typical domestic and foreign application cases and research results, demonstrating the superior performance of 9727 catalysts in the molding of complex shape products.

1. Foreign application cases

(1) Forming of automotive interior parts

In the United States, a well-known auto parts manufacturer uses 9727 catalyst for the molding of automotive interior parts. The manufacturer produces complex-shaped interior parts such as seat backs and instrument panels, which require extremely high surface quality and dimensional accuracy. By introducing 9727 catalyst, the company successfully solved the problems of bubbles, cracks and other problems caused by traditional catalysts, and the product pass rate increased by about 30%. In addition, the rapid curing properties of the 9727 catalyst shortened the production cycle by about 25%, greatly improving production efficiency (Johnson et al., 2017).

(2) Manufacturing of wind turbine blades

In Europe, the wind power industry has a growing demand for polyurethane materials. As a key component, the forming process of wind turbine blades is very complicated, especially the tip part of the blades, with extremely thin wall thickness and irregular shape. A German wind power equipment manufacturer successfully achieved efficient blade forming by using 9727 catalyst. Research shows that the 9727 catalyst not only improves the fluidity of the material, but also significantly reduces the generation of bubbles, which greatly improves the surface quality of the blades. In addition, the high selectivity of the 9727 catalyst also reduces the occurrence of side reactions, reduces material waste, and reduces production costs (Schmidt et al., 2019).

2. Domestic application cases

(1) Manufacturing of medical devices

In China, polyurethane materials are widely used in the field of medical devices, especially in complex shape implants and surgical devices. A medical device company in Shanghai uses 9727 catalyst to manufacture artificial joints, dental restoration materials and other products. The company found that the 9727 catalyst can significantly improve the surface quality and mechanical properties of the product, especially during the molding of complex shapes. The high flowability of the 9727 catalyst allows the material to fully fill the mold, avoiding the occurrence of hollows and cracks. In addition, the rapid curing characteristics of the 9727 catalyst shortens the production cycle by about 30%, reducing production costs (Zhang et al., 2020).

(2) Forming of building insulation materials

In the construction industry, polyurethane foam materials are widely used for their excellent thermal insulation properties. A building materials company in Beijing successfully solved the bubble problem caused by traditional catalysts by using 9727 catalyst. Research shows that the 9727 catalyst can effectively inhibit the side reaction between isocyanate and water, reduce the formation of carbon dioxide, make the density of the foam material more uniform, and the insulation performance is significantly improved. In addition, the high selectivity of the 9727 catalyst also reduces the occurrence of side reactions, reduces material waste, and reduces production costs (Liu et al., 2021).

Conclusion and Outlook

To sum up, as a new type of polyurethane catalyst, 9727 catalyst has shown significant advantages in the molding process of complex shape products. Its unique molecular structure and excellent catalytic properties enable it to ensure product quality while greatly improving production efficiency and reducing production costs. Specifically, the 9727 catalyst has the advantages of rapid curing, high flowability, reducing bubbles and pores, improving surface quality and demolding performance, and is suitable for the molding of complex-shaped products in many fields such as automobiles, wind power, medical devices, and construction.

In the future, with the continuous expansion of the application field of polyurethane materials, the requirements for catalysts will become higher and higher. The 9727 catalyst is expected to be used in the molding of more complex shape products and provide strong support for technological innovation and development in related industries. At the same time, researchers can further explore the synergistic effects of 9727 catalyst and other additives, and develop more high-performance polyurethane materials to meet the market's demand for high-quality, high-efficiency and low-cost products.

In short, the 9727 catalyst has broad application prospects in the molding of complex shape products and is worthy of in-depth research and promotion.

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