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A modified polyurethane material

A polyurethane material and modification technology, applied in the field of polyurethane, can solve the problems such as the influence of the addition amount and the dispersion state of the modified material on the damping performance and the inability of the target material to achieve the modification effect.

Active Publication Date: 2021-05-04
浙江中科应化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the morphology, structure, addition amount and dispersion state of nanomaterials all have a significant impact on the damping performance of the modified material.
When nanomaterials are used in the preparation of damping materials or other material modification, the biggest problem is the adsorption of nanoparticles and the aggregation of nanoparticles as a whole, which also makes the target material unable to achieve the expected modification effect.

Method used

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  • A modified polyurethane material
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  • A modified polyurethane material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] First, the graphite or graphene material is oxidized by the Hummers method to obtain graphene oxide. 0.2 g of graphene oxide was ultrasonically dispersed in 100 ml of tetrahydrofuran solution for 15 minutes, and a graphene oxide colloidal solution was obtained after ultrasonic dispersion.

[0065] Then add 0.4 g of maleic anhydride to the graphene oxide colloidal solution, and ultrasonically disperse for 15 minutes. The graphene oxide / maleic anhydride / THF mixture was irradiated in a Co-60 source with a radiation dose of 40 kGy and a dose rate of 25 Gy / min. The modified graphene oxide is obtained after the insoluble matter in the mixed solution after irradiation is suction-filtered, washed to neutrality and dried.

[0066] Weigh 0.2 g of modified graphene oxide, soak in 1 mmol / L KOH aqueous solution and 1 mmol / L hydrochloric acid solution for 5 minutes and 10 minutes respectively for hydrolysis. After the product was suction-filtered and washed with deionized water to ...

Embodiment 2

[0072] Get 1g of hydroxyl-modified graphene (structure such as figure 2 Shown, prepare according to the method for embodiment 1), through titration and calculating the areal density of the hydroxyl group on the graphene sheet surface modified by hydroxyl group is 13.6nmol / cm 2 (The surface density of graphene is based on the theoretical value of 0.77mg / m 2 ).

[0073] Get 65g of isophorone diisocyanate (IPDI) and mix with the graphene of hydroxyl modification, obtain modified polyurethane material after curing.

[0074] According to the dynamic mechanical test (tensile mode, frequency 1Hz), the modified polyurethane material obtained in Example 2, when the loss factor is greater than 0.5, the corresponding damping temperature range is -86-20°C, and the highest loss factor is 3.1.

Embodiment 3

[0076] Get 1g of hydroxyl-modified graphene (structure such as image 3 Shown, prepare according to the method for embodiment 1), through titration and calculation the areal density of graphene sheet surface hydroxyl is 18.5nmol / cm 2 (The surface density of graphene is based on the theoretical value of 0.77mg / m 2 ).

[0077] Get 85g of lysine diisocyanate (LDI) and hydroxyl-modified graphene to mix, and obtain modified polyurethane material after curing.

[0078] According to the test, when the loss factor of the modified polyurethane material obtained in Example 3 is greater than 0.5, the corresponding damping temperature range is -91°C to 18°C, and the highest loss factor is 2.3.

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Abstract

The invention provides a modified polyurethane material obtained by reacting diisocyanate compounds with hydroxyl-modified graphene. Compared with the prior art, the hydroxyl-modified graphene used in the present invention has a special structure. By controlling the length and quantity of the alkane hydroxyl chain segment on the graphene sheet, the "liquid state" of the graphene material can be realized. It can also provide sufficient steric hindrance effect to limit the irreversible stacking of graphene sheets, which solves the dispersion problem of graphene modified as a nanomaterial, and the hydroxyl-modified graphene can be directly used as a component of polyurethane material to react with diisocyanate compounds After curing, the obtained modified polyurethane material not only has excellent damping performance, but also has a very stable internal structure.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, in particular to a modified polyurethane material. Background technique [0002] Polyurethane is a polymer containing carbamate groups in the main chain prepared from diisocyanate and hydroxyl-terminated polyester. It can be divided into two categories: polyester polyurethane and polyether polyurethane. Since the ratio of soft segment (polyether polyol or polyester polyol) and hard segment (chain extender or isocyanate) in the polyurethane structure can be adjusted in a wide range, polyurethane materials with different hardness can be obtained through formula regulation . [0003] Due to the adjustable and changeable composition, structure and performance, polyurethane has been widely used as a damping material at present. By adjusting the ratio of soft and hard segments, a polymer damping material with a wide temperature range can be obtained. At present, the methods used to improve the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K9/04C08K9/02C08K9/00C08K3/04
Inventor 郑春柏柳美华尹园魏巍张依帆邓鹏飏
Owner 浙江中科应化科技有限公司