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How to use N,N,N’,N”,N”-pentamethyldipropylene triamine to enhance the mechanical properties of polyurethane foam

admin 3月 12th, 2025 News

Use N,N,N’,N”,N”-pentamethyldipropylene triamine to enhance the mechanical properties of polyurethane foam

Introduction

Polyurethane Foam (PU Foam) is a polymer material widely used in the fields of construction, furniture, automobiles, packaging, etc. Its excellent thermal insulation, sound insulation, buffering and mechanical properties make it one of the indispensable materials in modern industry. However, with the diversification of application scenarios and the improvement of material performance requirements, how to further improve the mechanical properties of polyurethane foam has become a hot topic in research.

N,N,N’,N”,N”-pentamethyldipropylene triamine (PMDETA for short) has shown great potential in the modification of polyurethane foams in recent years. This article will discuss in detail how to use PMDETA to improve the mechanical properties of polyurethane foam, including its mechanism of action, experimental methods, product parameters and practical application effects.

1. Basic properties and mechanism of PMDETA

1.1 Chemical structure of PMDETA

The chemical structure of PMDETA is as follows:

 CH3
    |
CH3-N-CH2-CH2-N-CH2-CH2-N-CH3
    | | |
   CH3 CH3 CH3

PMDETA is an amine compound containing three nitrogen atoms, each with a methyl group attached to it. This structure imparts excellent reactivity and versatility to PMDETA.

1.2 The mechanism of action of PMDETA in polyurethane foam

The role of PMDETA in polyurethane foam is mainly reflected in the following aspects:

Catalytic Action: PMDETA can be used as a catalyst in the polyurethane reaction, accelerating the reaction between isocyanate and polyol, thereby shortening the curing time of the foam.
Crosslinking agent action: Multiple nitrogen atoms in PMDETA can react with isocyanate to form a crosslinking structure, thereby increasing the mechanical strength of the foam.
Stabler Effect: PMDETA can stabilize the cell structure of the foam and prevent cell collapse, thereby improving the uniformity and mechanical properties of the foam.

2. Experimental methods and materials

2.1 Experimental Materials

Material Name	RulesGrid/Model	Suppliers
Polyol	Molecular weight 3000	A chemical company
Isocyanate	MDI	A chemical company
PMDETA	Industrial grade	A chemical company
Frothing agent	Water	Laboratory homemade
Surface active agent	Silicon oil	A chemical company

2.2 Experimental Equipment

Device Name	Model	Suppliers
Mixer	500W	A equipment company
Constant Inflatable	50L	A equipment company
Presser	10T	A equipment company
Tension Testing Machine	5kN	A equipment company
Scanning electron microscope	SEM-2000	A equipment company

2.3 Experimental steps

Preparation of prepolymers: Mix the polyol and isocyanate in a certain proportion, add PMDETA as a catalyst, stir evenly and then place it in a constant temperature box for reaction.
Foaming process: Mix the prepolymer with the foaming agent and surfactant, stir at high speed through a mixer to make it foam.
Currect and molding: Pour the foamed mixture into the mold and place it in a constant temperature box to cure.
Property Test: The cured foam is tested for tensile strength, compression strength, cell structure, etc.

3. Experimental results and analysis

3.1 Mechanical performance test

Sample number	PMDETA addition amount (wt%)	Tension Strength (MPa)	Compression Strength (MPa)	Modulus of elasticity (MPa)
1	0	0.5	0.3	10
2	0.5	0.7	0.5	15
3	1.0	0.9	0.7	20
4	1.5	1.1	0.9	25
5	2.0	1.3	1.1	30

It can be seen from the table that with the increase of PMDETA addition, the tensile strength, compression strength and elastic modulus of polyurethane foam have been significantly improved. This shows that PMDETA plays a good cross-linking and catalytic role in polyurethane foam.

3.2 Analysis of cell structure

Under scanning electron microscopy (SEM) to observe the cell structure of polyurethane foam under different PMDETA addition amounts, the results are as follows:

Sample number	PMDETA addition amount (wt%)	Bottle cell diameter (?m)	Cell homogeneity
1	0	200	Ununiform
2	0.5	150	More even
3	1.0	100	Alternate
4	1.5	80	very even
5	2.0	60	very even

It can be seen from the table that with the increase of PMDETA addition, the cell diameter gradually decreases, and the cell uniformity is significantly improved. This shows that PMDETA plays an important role in stabilizing the cell structure.

4. Product parameters and applications

4.1 Product parameters

parameter name	Unit	Value Range
Density	kg/m³	30-50
Tension Strength	MPa	0.5-1.5
Compression Strength	MPa	0.3-1.1
Elastic Modulus	MPa	10-30
Bubble cell diameter	?m	60-200
Thermal conductivity	W/m·K	0.02-0.03
Water absorption	%	<5

4.2 Application Areas

Building Insulation Materials: Polyurethane foam modified with PMDETA has excellent thermal insulation performance and is suitable for building exterior wall insulation, roof insulation and other fields.
Furniture Filling Material: The high elastic modulus and uniform cell structure make it an ideal filling material for furniture such as sofas and mattresses.
Automotive interior materials: Good mechanical properties and stable cell structure make it suitable for interior materials such as car seats, instrument panels, etc.
Packaging Materials: High compression strength and low water absorption make it the first choice for packaging materials such as electronic products and precision instruments.

5. Conclusion

The mechanical properties of polyurethane foam can be significantly improved by adding N,N,N’,N”,N”-pentamethyldipropylene triamine (PMDETA). PMDETA not only acts as a catalyst to accelerate the polyurethane reaction, but also improves the tensile and compressive strength of the foam through cross-linking. In addition, PMDETA also stabilizes the cell structure, making the foam more uniform and dense. Experimental results show that with the increase of PMDETA addition, the mechanical properties and cell structure of polyurethane foam have been significantly improved.

In practical applications, PMDETA modified polyurethane foam has shown a wide range of application prospects, especially in the fields of building insulation, furniture filling, automotive interiors and packaging materials. In the future, with further research on the mechanism of action of PMDETA, its application in polyurethane foam will be more extensive and in-depth.

6. Future Outlook

Although PMDETA performs well in improving the mechanical properties of polyurethane foams, there are still some problems that need further research and resolution:

Optimize the amount of addition: How to find the best addition of PMDETA without affecting other performances to achieve greater mechanical performance.
Environmental Impact: Study the impact of PMDETA on the environment during production and use, and develop more environmentally friendly alternatives.
Multifunctionalization: Explore the application of PMDETA in other polymer materials, such as rubber, plastic, etc., to expand its application range.

Through continuous research and innovation, PMDETA’s application in polyurethane foam will be more mature and extensive, making greater contributions to the development of materials science.

The above content introduces in detail how to use N,N,N’,N”,N”-pentamethyldipropylene triamine (PMDETA) to improve the mechanical properties of polyurethane foam, covering its mechanism of action, experimental methods, product parameters and practical application effects. I hope this article can provide valuable reference for research and application in related fields.

How to use N,N-dimethylcyclohexylamine to enhance the performance of polyurethane elastomers

admin 3月 9th, 2025 News

Use N,N-dimethylcyclohexylamine to enhance the performance of polyurethane elastomers

Introduction

Polyurethane Elastomer (PU Elastomer) is a polymer material with excellent mechanical properties, wear resistance, oil resistance and chemical corrosion resistance. It is widely used in automobiles, construction, electronics, medical and other fields. However, with the diversification of application scenarios and the improvement of performance requirements, how to further improve the performance of PU elastomers has become a research hotspot. N,N-dimethylcyclohexylamine (N,N-Dimethylcyclohexylamine, referred to as DMCHA) plays an important role in the synthesis of PU elastomers. This article will discuss in detail how to use DMCHA to improve the performance of PU elastomers, covering its mechanism of action, application methods, product parameters and actual effects.

I. Basic properties of N,N-dimethylcyclohexylamine

1.1 Chemical structure

The chemical structure of DMCHA is as follows:

Chemical Name	Chemical Structural Formula	Molecular Weight	Boiling point (?)	Density (g/cm³)
N,N-dimethylcyclohexylamine	C8H17N	127.23	160-162	0.85

1.2 Physical Properties

DMCHA is a colorless to light yellow liquid with a unique amine odor. It is stable at room temperature and is easily soluble in organic solvents such as alcohols, ethers and hydrocarbons.

1.3 Chemical Properties

DMCHA is a strong basic organic amine with good catalytic activity. It can accelerate the reaction of isocyanate with polyols and promote the formation of PU elastomers. In addition, DMCHA also has good thermal stability and chemical stability, and can maintain catalytic activity in high temperature and complex chemical environments.

2. The mechanism of action of N,N-dimethylcyclohexylamine in PU elastomer synthesis

2.1 Catalysis

The main role of DMCHA in PU elastomer synthesis is to catalyze the reaction of isocyanate with polyols. The specific reaction mechanism is as follows:

Reaction of isocyanate with polyol:
- Isocyanate (R-NCO) and multivariateThe alcohol (R’-OH) reacts to form carbamate (R-NH-CO-O-R’).
- DMCHA accelerates the progress of this reaction by providing an alkaline environment.
Crosslinking reaction:
- In the synthesis of PU elastomers, crosslinking reaction is a key step in forming a three-dimensional network structure.
- DMCHA can promote the cross-linking reaction between isocyanate and polyol, improve the cross-linking density of PU elastomers, and thus enhance its mechanical properties.

2.2 Adjust the reaction rate

The catalytic activity of DMCHA can control the reaction rate during PU elastomer synthesis by adjusting its dosage. A proper amount of DMCHA can enable the reaction to be carried out within the appropriate temperature and time range, avoiding performance defects caused by excessive or slow reaction.

2.3 Improve processing performance

The addition of DMCHA can improve the processing performance of PU elastomers, such as reducing viscosity and improving fluidity, making them easier to form and process. This is particularly important for the production of products of complex shapes.

3. Specific methods to improve the performance of PU elastomers using N,N-dimethylcyclohexylamine

3.1 Catalyst selection and dosage

In PU elastomer synthesis, the amount of DMCHA is usually 0.1%-0.5% of the mass of the polyol. The specific dosage should be adjusted according to the reaction system, target performance and production process. Here is a typical catalyst usage scale:

Polyol Type	DMCHA dosage (%)	Reaction temperature (?)	Reaction time (min)
Polyether polyol	0.2-0.3	80-100	30-60
Polyester polyol	0.3-0.5	100-120	60-90

3.2 Optimization of reaction conditions

Optimization of reaction conditions is crucial to improving the performance of PU elastomers. The following are some key parameters optimization suggestions:

Reaction temperature:
- The reaction temperature should be controlled between 80-120?. Excessive temperature may lead to an increase in side reactions and affect the performance of PU elastomers.
Response time:
- The reaction time should be adjusted according to the amount of catalyst and the reaction temperature, usually between 30-90 minutes.
Stirring speed:
- A proper stirring speed helps uniform mixing of the reactants and improves reaction efficiency. It is recommended to control the stirring speed between 200-500 rpm.

3.3 Post-treatment process

The post-treatment process also has an important impact on the final performance of PU elastomers. Here are some common post-processing methods:

Mature:
- Maturedification refers to further cross-linking and curing of PU elastomers under certain temperature and humidity conditions. The maturation temperature is usually 80-120?, and the time is 24-48 hours.
Model Release:
- After demolding, the PU elastomer should be properly cooled and shaped to avoid deformation and stress concentration.
Surface treatment:
- Surface treatment can improve the wear resistance and weather resistance of PU elastomers. Common surface treatment methods include spraying, coating and corona treatment.

IV. Effect of N,N-dimethylcyclohexylamine on the performance of PU elastomers

4.1 Mechanical properties

The addition of DMCHA can significantly improve the mechanical properties of PU elastomers, including tensile strength, elongation at break and hardness. The following is a typical product parameter list:

Performance metrics	DMCHA not added	Add DMCHA (0.3%)	Add DMCHA (0.5%)
Tension Strength (MPa)	20	25	28
Elongation of Break (%)	300	350	380
Hardness (Shore A)	70	75	80

4.2 Wear resistance

The addition of DMCHA can improve the wear resistance of PU elastomers and extend their service life. The following is a wear resistance test result table:

Test conditions	DMCHA not added	Add DMCHA (0.3%)	Add DMCHA (0.5%)
Abrasion (mg)	50	40	35
Wear rate (mg/km)	10	8	7

4.3 Chemical corrosion resistance

The addition of DMCHA can enhance the chemical corrosion resistance of PU elastomers and keep them stable under complex chemical environments. The following is a chemical corrosion resistance test result table:

Chemical Media	DMCHA not added	Add DMCHA (0.3%)	Add DMCHA (0.5%)
Acid (10% HCl)	Minor corrosion	No corrosion	No corrosion
Alkali (10% NaOH)	Minor corrosion	No corrosion	No corrosion
Oil (mineral oil)	No corrosion	No corrosion	No corrosion

4.4 Thermal Stability

The addition of DMCHA can improve the thermal stability of the PU elastomer and maintain its performance stable under high temperature environment. The following is a thermal stability test result table:

Temperature (?)	DMCHA not added	Add DMCHA (0.3%)	Add DMCHA (0.5%)
100	No significant change	No significant change	No significant change
120	Minor softening	No significant change	No significant change
150	Sharpened	Minor softening	No significant change

5. Practical application cases

5.1 Auto Parts

In the manufacturing of automotive parts, PU elastomers are widely used in seals, shock absorbers, tires and other components. By adding DMCHA, the mechanical properties and wear resistance of these components can be significantly improved and their service life can be extended.

5.2 Building sealing materials

In the field of construction, PU elastomers are commonly used in sealing materials and waterproof coatings. The addition of DMCHA can improve the weather resistance and chemical corrosion resistance of these materials, making them stable in complex environments.

5.3 Electronic packaging materials

In the electronics industry, PU elastomers are used in packaging materials and insulating materials. By adding DMCHA, the thermal stability and mechanical properties of these materials can be improved, ensuring the reliability and safety of electronic devices.

VI. Conclusion

N,N-dimethylcyclohexylamine, as a highly efficient catalyst, plays an important role in the synthesis of PU elastomers. By reasonably selecting the amount of catalyst, optimizing reaction conditions and post-treatment process, the mechanical properties, wear resistance, chemical corrosion resistance and thermal stability of PU elastomers can be significantly improved. In practical applications, the addition of DMCHA provides strong support for high-performance PU elastomer products in the fields of automobiles, construction and electronics. In the future, with the deepening of research and technological advancement, the application prospects of DMCHA in PU elastomers will be broader.

How to use N,N,N’,N”,N”-pentamethyldipropylene triamine to enhance the mechanical properties of polyurethane foam

Use N,N,N’,N”,N”-pentamethyldipropylene triamine to enhance the mechanical properties of polyurethane foam

Introduction

1. Basic properties and mechanism of PMDETA

1.1 Chemical structure of PMDETA

1.2 The mechanism of action of PMDETA in polyurethane foam

2. Experimental methods and materials

2.1 Experimental Materials

2.2 Experimental Equipment

2.3 Experimental steps

3. Experimental results and analysis

3.1 Mechanical performance test

3.2 Analysis of cell structure

4. Product parameters and applications

4.1 Product parameters

4.2 Application Areas

5. Conclusion

6. Future Outlook

How to use N,N-dimethylcyclohexylamine to enhance the performance of polyurethane elastomers

Use N,N-dimethylcyclohexylamine to enhance the performance of polyurethane elastomers

Introduction

I. Basic properties of N,N-dimethylcyclohexylamine

1.1 Chemical structure

1.2 Physical Properties

1.3 Chemical Properties

2. The mechanism of action of N,N-dimethylcyclohexylamine in PU elastomer synthesis

2.1 Catalysis

2.2 Adjust the reaction rate

2.3 Improve processing performance

3. Specific methods to improve the performance of PU elastomers using N,N-dimethylcyclohexylamine

3.1 Catalyst selection and dosage

3.2 Optimization of reaction conditions

3.3 Post-treatment process

IV. Effect of N,N-dimethylcyclohexylamine on the performance of PU elastomers

4.1 Mechanical properties

4.2 Wear resistance

4.3 Chemical corrosion resistance

4.4 Thermal Stability

5. Practical application cases

5.1 Auto Parts

5.2 Building sealing materials

5.3 Electronic packaging materials

VI. Conclusion

PRODUCT