Catalytic efficiency of PMDETA in polyisocyanurate sheets

PMDETA, full name N,N,N’,N’,N”,N”-Hexamethyldiethylenetriamine (hexamethyldiethylenetriamine) , is an efficient organic catalyst, especially playing a key role in the chemical reaction of polyurethane (PU). When applied to the production of polyisocyanurate (PIR) sheets, the catalytic efficiency of PMDETA is directly related to the foaming quality, physical properties and production efficiency of the sheets. This article will explore the catalytic mechanism, influencing factors and performance optimization of PMDETA in polyisocyanurate sheets.

Catalytic mechanism

In the synthesis process of polyisocyanurate sheets, PMDETA mainly catalyzes the reaction between isocyanate groups and water, that is, the foaming reaction, and also helps balance the gel reaction. PMDETA promotes the contact between isocyanate groups and water molecules by donating protons or accepting protons, accelerating the generation of carbon dioxide, thereby producing foam. In addition, it participates in the cross-linking reaction between isocyanate groups to form a polyurethane network, which is called a gel reaction.

Factors affecting catalytic efficiency

The catalytic efficiency of PMDETA is affected by many factors, including but not limited to temperature, reactant concentration, pH value of the reaction medium, and the concentration of PMDETA itself. Increasing temperature usually increases catalytic efficiency, but too high a temperature may lead to the occurrence of side reactions; changes in reactant concentration will affect the relative proportion of the catalyst, thereby affecting catalytic efficiency; adjustment of pH value can optimize the active state of the catalyst; PMDETA The concentration directly determines the strength of its catalytic ability.

Performance optimization

The application of PMDETA in polyisocyanurate sheets can significantly improve the performance of the sheets. First, the strong foaming effect of PMDETA improves the fluidity of the foam, making the board more uniform during the molding process and reducing the problem of uneven internal pores. Secondly, the use of PMDETA helps control the density and closed cell ratio of the board, thereby improving its thermal insulation performance. Thirdly, due to the efficient catalytic effect of PMDETA, the production cycle of the plate can be shortened, the production efficiency is improved, and the energy consumption is also reduced.

Practical applications and challenges

In actual production, the addition amount of PMDETA needs to be precisely controlled to achieve excellent catalytic effect. Too much PMDETA may cause over-foaming of the foam and affect the mechanical strength of the board; while too little may cause insufficient foaming and reduce the thermal insulation performance of the board. Therefore, manufacturers need to adjust the amount of PMDETA according to specific process conditions and plate specifications to achieve excellent performance.

Conclusion

PMDETA’s catalytic efficiency in the production of polyisocyanurate sheets is crucial to ensuring the quality and production efficiency of the sheets. By finely adjusting the catalytic conditions, the catalytic effect of PMDETA can be improved, thereby producing high-quality polyisocyanurate sheets with good thermal insulation properties, high strength and low thermal conductivity. With the continuous development of the polyurethane industry, the demand for efficient catalysts is growing day by day. As a catalyst with excellent performance, PMDETA will play a more important role in the production of polyisocyanurate sheets in the future, promoting technological innovation and development in the industry. product upgrade.

Extended reading:

CAS:2212-32-0 – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co., LTD

N,N-Dicyclohexylmethylamine – Manufacturer of N,N-Dicyclohexylmethylamine and N,N-Dimethylcyclohexylamine – Shanghai Ohans Co ., LTD

bismuth neodecanoate/CAS 251-964-6 – Amine Catalysts (newtopchem.com)

stannous neodecanoate catalysts – Amine Catalysts (newtopchem.com)

polyurethane tertiary amine catalyst/Dabco 2039 catalyst – Amine Catalysts (newtopchem.com)

DMCHA – morpholine

N-Methylmorpholine – morpholine

Polycat 41 catalyst CAS10294-43-5 Evonik Germany – BDMAEE

Polycat DBU catalyst CAS6674-22-2 Evonik Germany – BDMAEE

Use of N-formylmorpholine in pesticides

N-formylmorpholine (NFM), as an organic compound, has found its unique application in the field of agricultural chemistry value, especially in the formulation and functional enhancement of pesticides. The versatility of NFM makes it an indispensable ingredient in pesticide formulations. Below we will explore the specific applications of N-formylmorpholine in pesticides and the scientific principles behind it.

1. As a solvent and synergist in pesticide formulations

N-Formylmorpholine is widely used as a solvent in pesticide formulations due to its excellent solubility properties. It can dissolve a variety of pesticide active ingredients, including those that are difficult to dissolve in water or other conventional solvents, thereby improving pesticide formulation efficiency and product quality. In addition, NFM, as a synergist, can enhance the biological activity of pesticides and improve their adhesion and penetration ability on the surface of target crops, thereby improving the efficiency of pesticide use and control effects.

2. Improve the stability of pesticides

NFM helps improve the stability of pesticides, especially under complex environmental conditions. It can protect the active ingredients of pesticides from the effects of light, heat, oxidation and other factors, extend the shelf life of pesticides, and ensure activity during storage and transportation. This improved stability is critical to the pesticide industry as it is directly related to the reliability and cost-effectiveness of pesticides in practical applications.

3. As an intermediate for synthetic pesticides

In the process of pesticide synthesis, N-formylmorpholine can serve as a key chemical intermediate and participate in the construction of specific structural units of pesticide molecules. Through the participation of NFM, chemists can design and synthesize a series of new pesticide compounds with different biological activities. These compounds may have higher selectivity, lower ecological risks, and longer duration of action, thereby providing safer and more effective pest management solutions for agricultural production.

4. Promote bioavailability of pesticides

The addition of NFM can significantly improve the adhesion and permeability of pesticides on plant leaves, which means that more active ingredients can be absorbed by crops and reach target pests and diseases. This characteristic is extremely important for improving the bioavailability of pesticides, because only when a sufficient amount of pesticides reaches the pests and diseases can it effectively exert its control effect, while also reducing environmental pollution and resource waste caused by excessive spraying.

5. Used for pesticide residue detection

In the field of pesticide residue analysis, N-formylmorpholine is sometimes used as a solvent or derivatization reagent during sample processing. With the assistance of NFM, pesticide residues can be more efficiently extracted and purified from complex matrices, thereby achieving accurate determination of pesticide residues in food and the environment, ensuring food safety and ecological environment monitoring.

6. As a component of biopesticides

In recent years, biopesticides have received increasing attention due to their lower environmental impact and eco-friendliness. NFM is used as a carrier or auxiliary for active ingredients in some biopesticide formulas to help deliver biologically active substances such as beneficial microorganisms, enzymes, and natural toxins to achieve the purpose of controlling pests and diseases. This application method not only reduces the dependence on chemical pesticides, but also promotes the sustainable development of agriculture.

Conclusion

The application of N-formylmorpholine in pesticides demonstrates its role in improving pesticide efficacy, ensuring crop health and promoting agricultural sustainability. important role. However, although NFM has significant advantages in the field of pesticides, its use still needs to be cautious and its potential effects on the environment and human health should be fully considered. Therefore, the development and use of pesticides must comply with strict regulatory standards to ensure that while increasing agricultural yields, they do not cause irreversible damage to the ecological environment. With the advancement of agricultural science and technology and the increase in environmental awareness, we look forward to seeing more innovative and green pesticide solutions, and N-formylmorpholine will play an indispensable role in this process.

Extended reading:

Niax A-1Niax A-99

BDMAEE Manufacture

Toyocat NP catalyst Tosoh

Toyocat MR Gel balanced catalyst tetramethylhexamethylenediamine Tosoh

N-Acetylmorpholine

N-Ethylmorpholine

NT CAT 33LV

NT CAT ZF-10

DABCO MP608/Delayed equilibrium catalyst

TEDA-L33B/DABCO POLYCAT/Gel catalyst

Production technology of N-formylmorpholine

N-formylmorpholine (NFM) is an important organic solvent and fine chemical raw material because of its good Due to its solubility, high boiling point and relatively low toxicity and corrosiveness, it is widely used in many industrial fields, such as aromatic hydrocarbon extraction, butene concentration, and natural gas desulfurization. The production process of NFM mainly involves the esterification reaction of morpholine and methyl formate as raw materials, usually in the presence of a catalyst. The following is a typical production process flow of N-formylmorpholine:

Raw material preparation:

  • Morpholine: A six-membered cyclic nitrogen-containing compound that serves as the amine component of the reaction.
  • Methyl formate: Methyl formate acts as an acylating agent and provides a formyl group.

Catalyst selection:

  • The choice of transesterification catalyst is crucial to the reaction efficiency. Commonly used catalysts include sodium alkoxide, potassium alkoxide, organotin, titanate and their compounds, such as sodium methoxide, potassium methoxide, sodium ethoxide, potassium ethoxide, Sodium tert-butoxide, potassium tert-butoxide, dibutyltin oxide, dioctyltin oxide, butyl titanate, etc.

Reaction conditions:

  • Mass ratio: The mass ratio of morpholine and methyl formate is usually 1.30~1.74:1 to ensure sufficient acylation reaction.
  • Catalyst dosage: The amount of catalyst added is generally 0.5% to 5% of the total weight of raw materials to promote the transesterification reaction.
  • Reaction pressure: The reaction can be carried out in the range of normal pressure to 0.6Mpa.
  • Reaction temperature: The appropriate reaction temperature range is 30~120? to balance the reaction rate and the suppression of side reactions.
  • Reaction time: The reaction time is usually set between 2 and 6 hours to ensure the completeness of the reaction.

Separation and purification:

  • Batch separation process:
    • Separation and recovery of methyl formate: through distillation, the operating pressure is 0.1~0.2Mpa, the reactor temperature is controlled at 68~82°C, and the methyl formate fraction is collected at the top of the tower.
    • Separation and recovery of methanol: Change the distillation pressure to normal pressure, raise the reactor temperature to 68~130°C, and collect methanol at the top of the tower.
    • Separation and recovery of morpholine: the crude product is filtered to remove the catalyst, and then distilled under a vacuum of 0.09~0.099MPa, the reactor temperature is 130 ~155?, morpholine is collected at the top of the tower.
    • Obtaining N-formylmorpholine: Maintain the above vacuum degree, raise the reactor temperature to 155~165°C, and collect N-formylmorpholine from the top of the tower.
  • Continuous separation process:
    • Similar to intermittent separation, but the entire process is carried out in continuous flow equipment, including flash tanks, evaporators, light component towers and vacuum product towers, etc., to improve efficiency and reduce energy consumption.

Product quality:

  • The N-formylmorpholine produced should be a colorless and transparent liquid that meets specific quality standards, such as purity, color, moisture content and other indicators.

The production process of N-formylmorpholine is a complex chemical engineering process that requires precise control of reaction conditions and separation steps to ensure the quality of the product quality and yield. As technology develops, continuous process optimization and improvement are necessary to increase production efficiency and reduce environmental impact.

Extended reading:

Niax A-1Niax A-99

BDMAEE Manufacture

Toyocat NP catalyst Tosoh

Toyocat MR Gel balanced catalyst tetramethylhexamethylenediamine Tosoh

N-Acetylmorpholine

N-Ethylmorpholine

NT CAT 33LV

NT CAT ZF-10

DABCO MP608/Delayed equilibrium catalyst

TEDA-L33B/DABCO POLYCAT/Gel catalyst