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Synthesis of MDI

This article details the synthesis process of diphenylmethane diisocyanate (MDI), focusing on its isomeric forms, industrial applications in polyurethane foams, and the two-step process involving the condensation of MDA and its subsequent phosgenation.

2024 07 05

How is TDI synthesized?

This article details the synthesis of toluene diisocyanate (TDI) isomers, including the processes of nitration, reduction, and phosgenation, and highlights the specifications and methods for producing TDI-100, TDI-80, and TDI-65.

2024 07 03

Introduction to Optical Chemical Processes - Tower Continuous Production Process

This article introduces the pressurized production process of organic isocyanates, detailing the chemical reactions involved, the benefits of high-pressure methods, and the operational steps to achieve higher yields and improved efficiency.

2024 07 01

Introduction to the Optical Chemical Process – High-Temperature One-Step Process

This article introduces the high-temperature one-step phosgenation process for producing isocyanates, highlighting its advantages over the traditional two-step method, including improved reaction speed, reduced energy consumption, and higher product purity.

2024 06 29

Introduction to the Optical Chemical Process - Kettle-Type Continuous Production Process

This article introduces the kettle-type continuous production process in optical chemistry, highlighting its high output, equipment efficiency, and stable product quality, while also addressing its limitations such as high phosgene consumption and multiple phosgene recovery steps.

2024 06 28

Optical Chemical Technology - Kettle Batch Production Process

This article introduces the kettle batch production process for isocyanates, highlighting its simplicity and suitability for small-batch production, but also noting drawbacks like low equipment utilization, long cycles, and safety concerns.

2024 06 27

Introduction to the Phosgenation Process for Amine--Basic Principles

The article introduces the phosgenation process for synthesizing isocyanates from amines and phosgene, detailing the basic principles, reaction steps, and various production methods used in large-scale industrial settings to achieve high yields and efficiency.

2024 06 26

Impact of Cross-Linking Degree on the Main Properties of Polyurethane

This article explores how cross-linking degree influences polyurethane properties, examining the effects of raw materials, molecular weight, and functionality on foam performance, and providing insights into optimizing polyurethane formulations for varied applications from soft to rigid foams.

2024 06 25

The Relationship Between the Pore Structure and Properties of Polyurethane Foam

This article explores the relationship between the pore structure and properties of polyurethane foam, highlighting how different levels of open-cell content affect the material's strength, resilience, and performance in both rigid and PU Flexible Foams.

2024 06 24

Basic Factors Affecting the Performance of Polyurethane Structure

This article explores the key factors influencing the performance of polyurethane structures, including molecular weight, intermolecular forces, chain unit rigidity, crystallinity, and cross-linking degree, providing insights into how these elements affect the material's properties.

2024 06 22

Influence of Various Groups in Polyurethane on Foam Properties

This article explores the influence of various functional groups in polyurethane on the properties of foam materials, emphasizing the relationship between group-specific cohesive energies and resulting thermal and mechanical characteristics, supported by comparative data and trends in polymer behavior.

2024 06 19

Explaining the Stability of Polyurethane Foam

This article explores the stability of polyurethane foam, examining the similarities and differences with soap solution bubbles, the effects of surface tension, viscosity, and other factors on bubble formation, and strategies to prevent cell rupture and ensure foam durability.

2024 06 18

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