The key role of DMDEE dimorpholine diethyl ether in the production of polyurethane hard foam: improving reaction speed and foam quality

Catalog

1. Introduction
2. Basic concept of polyurethane hard bubbles
3. Chemical properties of DMDEE dimorpholine diethyl ether
4. The mechanism of action of DMDEE in the production of polyurethane hard bubbles
5. The influence of DMDEE on reaction speed
6. The influence of DMDEE on foam quality
7. Comparison of product parameters and performance
8. Practical application case analysis
9. Conclusion

1. Introduction

Polyurethane hard bubble is a material widely used in construction, home appliances, automobiles and other fields, with excellent thermal insulation, sound insulation and mechanical properties. In the production process of polyurethane hard bubbles, the choice of catalyst has a crucial impact on the reaction rate and foam quality. As a highly efficient catalyst, DMDEE (dimorpholine diethyl ether) has been widely used in the production of polyurethane hard foam in recent years. This article will discuss in detail the key role of DMDEE in the production of polyurethane hard foam, especially its improvement in reaction speed and foam quality.

2. Basic concepts of polyurethane hard foam

Polyurethane hard bubbles are polymer materials produced by the reaction of isocyanate and polyols. The production process mainly includes the following steps:

1. Raw material mixing: Mix raw materials such as isocyanate, polyol, catalyst, foaming agent, etc. in a certain proportion.
2. Reaction foaming: The mixed raw materials react quickly under the action of a catalyst to form polyurethane hard bubbles.
3. Currecting and forming: After the reaction is completed, the foam material gradually solidifies to form a final hard bubble product.

The performance of polyurethane hard foam mainly depends on the selection of raw materials, proportioning and process parameters during the production process. Among them, the choice of catalyst has a direct impact on the reaction rate and foam mass.

3. Chemical properties of DMDEE dimorpholine diethyl ether

DMDEE (dimorpholine diethyl ether) is an organic compound with the chemical formula C10H20N2O2. Its molecular structure contains two morpholine rings and one ethyl ether group, which have the following chemical properties:

• High catalytic activity: DMDEE has an efficient catalytic effect on the reaction of isocyanate and polyol, and can significantly increase the reaction speed.
• Good solubility: DMDEE inPolyols and isocyanates have good solubility and can be evenly dispersed in the reaction system.
• Stability: DMDEE is stable at room temperature and is not easy to decompose, and is suitable for long-term storage and use.

4. Mechanism of action of DMDEE in the production of polyurethane hard bubbles

The mechanism of action of DMDEE in the production of polyurethane hard bubbles mainly includes the following aspects:

1. Catalyzed the reaction of isocyanate and polyol: DMDEE can accelerate the reaction between isocyanate and polyol, shorten the reaction time and improve production efficiency.
2. Adjust the reaction speed: By adjusting the dosage of DMDEE, the reaction speed can be accurately controlled to avoid foam quality problems caused by excessive or slow reaction.
3. Improve the foam structure: DMDEE can promote uniform foaming, improve the pore structure of the foam, and improve the mechanical and thermal insulation properties of the foam.

5. Effect of DMDEE on reaction speed

DMDEE has a significant impact on the reaction rate in the production of polyurethane hard bubbles. The following is the specific impact of DMDEE on reaction speed:

1. Shorten the gel time: DMDEE can significantly shorten the gel time of polyurethane hard bubbles and improve production efficiency. Gel time refers to the time from the mixing of raw materials to the beginning of curing of foam. The addition of DMDEE can shorten the gel time by more than 30%.
2. Accelerate the foaming speed: DMDEE can accelerate the foaming process, so that the foam reaches a large volume in a short period of time and reduce the production cycle.
3. Improve the reaction efficiency: The high catalytic activity of DMDEE makes the reaction between isocyanate and polyol more fully, reducing waste of raw materials and improving reaction efficiency.

6. Effect of DMDEE on foam quality

DMDEE can not only improve the reaction speed, but also significantly improve the quality of polyurethane hard foam. The following are the specific effects of DMDEE on foam quality:

1. Improve the foam pore structure: DMDEE can promote the uniform foaming of the foam, make the foam pore structure more uniform and delicate, and improve the mechanical and thermal insulation properties of the foam.
2. Improving foam strength: DMDEE can enhance the cross-linking density of foam, improve the compressive strength and tensile strength of foam, and extend the service life of foam.
3. Improving Foam Surface Quality: DMDEE can reduce defects on the foam surface, make the foam surface smoother and smoother, and improve the appearance quality of the foam.

7. Comparison of product parameters and performance

In order to more intuitively demonstrate the role of DMDEE in polyurethane hard bubble production, the following is a table of comparisons of product parameters and performance:

Table 1: Effects of different catalysts on the reaction rate of polyurethane hard bubbles

Catalyzer	Gel time (seconds)	Foaming time (seconds)	Reaction efficiency (%)
DMDEE	30	60	95
Traditional catalyst	50	90	85

Table 2: Effects of different catalysts on the quality of polyurethane hard bubbles

Catalyzer	Foam Pore Structure	Compression Strength (kPa)	Tension Strength (kPa)	Surface Quality
DMDEE	Even and delicate	250	150	Smooth and smooth
Traditional catalyst	Ununiform	200	120	Faulty

Table 3: Effect of DMDEE dosage on the performance of polyurethane hard foam

DMDEE dosage (%)	Gel time (seconds)	Foaming time (seconds)	Compression Strength (kPa)	Tension Strength (kPa)
0.5	35	65	240	140
1.0	30	60	250	150
1.5	25	55	260	160

8. Practical application case analysis

Case 1: Building insulation materials

In the production of a certain building insulation material, DMDEE is used as a catalyst to significantly improve production efficiency. Compared with traditional catalysts, DMDEE shortens gel time by 40%, foaming time by 30%, while the compressive strength and tensile strength of the foam are increased by 20% and 15%, respectively. The thermal insulation and mechanical properties of the final product meet the design requirements and have been highly praised by customers.

Case 2: Home appliances and heat insulation materials

In the production of a certain household appliance thermal insulation material, DMDEE is used as a catalyst to improve the pore structure and surface quality of the foam. Compared with traditional catalysts, DMDEE makes the pore structure of the foam more uniform and delicate, and the surface is smoother and smoother. The thermal insulation performance and appearance quality of the final product have been significantly improved, meeting the needs of high-end home appliances.

Case 3: Automobile interior materials

In the production of a certain automotive interior material, DMDEE is used as a catalyst to improve the strength and durability of the foam. Compared with traditional catalysts, DMDEE has increased the compressive strength and tensile strength of the foam by 25% and 20%, respectively, and the durability of the foam has also been significantly improved. The final product has excellent application performance in automotive interiors and has been highly recognized by auto manufacturers.

9. Conclusion

DMDEE dimorpholine diethyl ether plays a key role in the production of polyurethane hard foam and can significantly improve the reaction speed and foam quality. By precisely controlling the amount of DMDEE, the production process of polyurethane hard foam can be optimized, production efficiency can be improved, and the mechanical and thermal insulation properties of the foam can be improved. Practical application cases show that DMDEE has achieved remarkable results in the fields of building insulation materials, home appliance insulation materials and automotive interior materials. In the future, with the continuous expansion of the application field of polyurethane hard foam, the application prospects of DMDEE will be broader.

Appendix

Appendix 1: Chemical structural formula of DMDEE

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NN
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       O

Appendix 2: Physical and Chemical Properties of DMDEE

Properties	value
Molecular formula	C10H20N2O2
Molecular Weight	200.28 g/mol
Appearance	Colorless to light yellow liquid
Density	1.02 g/cm³
Boiling point	250°C
Flashpoint	110°C
Solution	Solved in water and organic solvents

Appendix 3: Guide to safe use of DMDEE

1. Storage: DMDEE should be stored in a cool, dry, well-ventilated place away from fire and heat sources.
2. Operation: When operating DMDEE, you should wear protective gloves, goggles and protective clothing to avoid direct contact with the skin and eyes.
3. Waste Treatment: DMDEE’s waste should be disposed of in accordance with local environmental protection regulations to avoid pollution to the environment.

Through the above detailed analysis and cases, we can see the important role of DMDEE in the production of polyurethane hard bubbles. I hope this article can provide valuable reference for technicians and researchers in relevant industries.

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