Preparation method of TODI base polyurethane micropore elastomer

Abstract

The invention discloses a method for producing a polyurethane micropore elastic body taking TODI as an isocyanate component, which aims at improving the heat resistance and wear resistance of the polyurethane micropore elastic body produced by the prior art. The product prepared by the method is mainly used as a high strength damping element bearing dynamic fatigue, such as buffering and damping elements in means of transportation such as automobile, damping blocks in bridges and the like.

Description

technical field

[0001] The invention relates to a preparation method of a polyurethane microcellular elastomer, in particular to a preparation method of a polyurethane microcellular elastomer with xylene diisocyanate (TODI) as an isocyanate component. Background technique

[0002] Due to the excellent static and dynamic mechanical properties of polyurethane microcellular elastomers, it is especially suitable for making damping system components under swing vibration conditions. Their industrial importance is due to the combination of their good mechanical properties and cheap and convenient processing methods. Using various chemical structural components in different mixing ratios can produce products with widely different mechanical properties and processability.

[0003] Chinese patent CN1982351A disclosed on June 20, 2007 a method for preparing an NDI-based polyurethane microcellular elastomer. The preparation method includes the following steps: (1) Preparation of prep...

Examples

Embodiment 1

[0028] Polyadipate with a molecular weight of 2000 reacts with TODI at 70-110°C to obtain a prepolymer with an NCO content of 6.2%. The main extender is polyadipate, and the foaming agent, catalyst, surface Active agent accounted for 3% of the total.

[0029] Using a low-pressure foaming machine, mix the prepolymer and the expansion agent according to the ratio of the isocyanate index to 100%, inject the reaction material liquid into the mold at 110°C, demould after 30 minutes, and post-cure at 110°C for 24hrs.

[0030] The above molded products have been subjected to 400,000 times of dynamic fatigue performance tests and the results are as follows:

[0031]

Embodiment 2

[0038] Polyadipate with a molecular weight of 2000 reacts with TODI at 70-110°C to obtain a prepolymer with an NCO content of 6.2%. The main extender is polyadipate, and the foaming agent, catalyst, surface Active agent accounted for 3% of the total.

[0039] Using a low-pressure foaming machine, mix the prepolymer and the expansion agent according to the ratio of the isocyanate index to 100%, inject the reaction material liquid into the mold at 110°C, demould after 30 minutes, and post-cure at 110°C for 24hrs.

[0040] The dynamic fatigue performance test results of the above molded products are as follows:

[0041]

technical field

[0001] The invention relates to a preparation method of a polyurethane microcellular elastomer, in particular to a preparation method of a polyurethane microcellular elastomer with xylene diisocyanate (TODI) as an isocyanate component. Background technique

[0002] Due to the excellent static and dynamic mechanical properties of polyurethane microcellular elastomers, it is especially suitable for making damping system components under swing vibration conditions. Their industrial importance is due to the combination of their good mechanical properties and cheap and convenient processing methods. Using various chemical structural components in different mixing ratios can produce products with widely different mechanical properties and processability.

[0003] Chinese patent CN1982351A disclosed on June 20, 2007 a method for preparing an NDI-based polyurethane microcellular elastomer. The preparation method includes the following steps: (1) Preparation of prep...

Examples

Embodiment 1

[0028] Polyadipate with a molecular weight of 2000 reacts with TODI at 70-110°C to obtain a prepolymer with an NCO content of 6.2%. The main extender is polyadipate, and the foaming agent, catalyst, surface Active agent accounted for 3% of the total.

[0029] Using a low-pressure foaming machine, mix the prepolymer and the expansion agent according to the ratio of the isocyanate index to 100%, inject the reaction material liquid into the mold at 110°C, demould after 30 minutes, and post-cure at 110°C for 24hrs.

[0030] The above molded products have been subjected to 400,000 times of dynamic fatigue performance tests and the results are as follows:

[0031]

Embodiment 2

[0038] Polyadipate with a molecular weight of 2000 reacts with TODI at 70-110°C to obtain a prepolymer with an NCO content of 6.2%. The main extender is polyadipate, and the foaming agent, catalyst, surface Active agent accounted for 3% of the total.

[0039] Using a low-pressure foaming machine, mix the prepolymer and the expansion agent according to the ratio of the isocyanate index to 100%, inject the reaction material liquid into the mold at 110°C, demould after 30 minutes, and post-cure at 110°C for 24hrs.

[0040] The dynamic fatigue performance test results of the above molded products are as follows:

[0041]

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