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A polyurea elastomer that completely replaces polyether with polysiloxane and its preparation method

A technology of polyurea elastomer and polysiloxane, which is applied in the field of synthesis of organosilicon polymer materials, can solve the problems of low reactivity, high temperature required for reaction, long reaction time, etc., and achieve simple reaction process, less Small microscopic phase separation, the effect of improving mechanical properties

Active Publication Date: 2021-04-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydroxyl-terminated polysiloxane used in this patent document has low reactivity, so the temperature required for the reaction is too high and the reaction time is long
And the amino-terminated compound used contains amino-terminated polyether, so there are still shortcomings of the traditional polysiloxane-polyether-polyurea
[0007] At present, there is no method that can avoid sharp phase separation without affecting the excellent performance of polysiloxane, thereby improving the mechanical properties of polysiloxane polyurea elastomers

Method used

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  • A polyurea elastomer that completely replaces polyether with polysiloxane and its preparation method
  • A polyurea elastomer that completely replaces polyether with polysiloxane and its preparation method
  • A polyurea elastomer that completely replaces polyether with polysiloxane and its preparation method

Examples

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Effect test

Embodiment 1

[0048] A kind of preparation method of the polyurea elastomer that completely replaces polyether with polysiloxane, comprises steps as follows:

[0049] In a four-necked flask equipped with a constant pressure dropping funnel, a drying tube, a mechanical stirrer, and a nitrogen gas feed device, add 30 g of dicyclohexylmethane diisocyanate, and mix with xylene and isopropanol (volume ratio: 6:1) The mixed solvent is completely dissolved, and under strong stirring, 70g of aminopropyl-terminated polydimethylsiloxane C with a molecular weight of 4000 is completely dissolved and then added dropwise to the above solution through the dropping funnel, and reacted at 40°C 30min, prepolymer D was prepared, and finally 20g of 2-methyl-1,5-pentanediamine was dissolved in the mixed solution, added dropwise into the reactor through the dropping funnel, reacted at 5°C for 10min, and poured the product into In the mold, the solvent is volatilized at room temperature to obtain an elastomer.

...

Embodiment 2

[0055] A kind of preparation method of the polyurea elastomer that completely replaces polyether with polysiloxane, comprises steps as follows:

[0056] In a four-necked flask equipped with a constant pressure dropping funnel, a drying tube, a mechanical stirrer, and a nitrogen gas feed device, add 20 g of diphenylmethane diisocyanate, and use tetrahydrofuran and dichloromethane (volume ratio: 8:1) The mixed solvent is completely dissolved, and under strong stirring, 60 g of aminopropyl-terminated polydimethylsiloxane C with a molecular weight of 2000 is completely dissolved and then added dropwise to the above solution through the dropping funnel, and reacted at 30°C for 10 minutes , to prepare prepolymer D, and finally dissolve 20g of hexamethylenediamine in the mixed solution, add it dropwise into the reactor through the dropping funnel, react at 10°C for 15min, pour the product into the mold, and remove the solvent by volatilization at room temperature. Get the elastomer. ...

Embodiment 3

[0061] A kind of preparation method of the polyurea elastomer that completely replaces polyether with polysiloxane, comprises steps as follows:

[0062] In a four-necked flask equipped with a constant pressure dropping funnel, drying tube, mechanical stirring and nitrogen feed device, add 30 g of dicyclohexylmethane diisocyanate, and use dimethyl sulfoxide and n-hexane (volume ratio is 8: 1) The mixed solvent is completely dissolved, and under strong stirring, 70 g of block copolymer A with a molecular weight of 3000 is completely dissolved and then added dropwise to the above solution through a dropping funnel, and reacted at 40°C for 20 minutes to prepare a prepolymer Object D, finally dissolve 20g of 4,4'-methylene bis(2-ethyl 6-methylcyclohexylamine) in the mixed solution, add it dropwise into the reactor through the dropping funnel, and react at 10°C for 20min , Pour the product into a mold, and evaporate the solvent at room temperature to obtain an elastomer.

[0063] T...

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Abstract

The invention relates to a polyurea elastomer which completely replaces polyether with polysiloxane and a preparation method thereof. The preparation method comprises the steps of: (1) adding a calculated amount of amine-propylene into a mixed solvent of organic solvents A and B, respectively Group-terminated polydimethylsiloxane C and diisocyanate compound, at 0-50°C, stirred and reacted for 10-80min to generate isocyanate-group-terminated low-molecular-weight prepolymer D; (2) Step (1) The prepolymer D generated in the above reaction reacts with the terminal amino compound at 0-30°C for 10-500min to obtain a mixed solution containing polysiloxane-polyurea polymer; then volatilize and remove the solvent to obtain the product. The invention adopts a mixed solvent and adjusts the molecular weight of polydimethylsiloxane terminated by aminopropyl group to reduce the sharp microscopic phase separation between the soft segment and the hard segment, thereby greatly improving the mechanical properties of the elastomer.

Description

technical field [0001] The invention relates to a polyurea elastomer in which polyether is completely replaced by polysiloxane and a preparation method thereof, and belongs to the technical field of synthesis of organosilicon polymer materials. Background technique [0002] Polysiloxane has a unique molecular structure composed of Si-O-Si main chain and organic side chains. It combines organic-inorganic dual characteristics and functions, and has an extremely low glass transition temperature (-123°C) , high and low temperature resistance, oxidation resistance, weather resistance, low surface energy and good hydrophobicity and other excellent properties. [0003] Thermoplastic polyurea elastomer (TPU) is a series of heterogeneous block polymers with excellent mechanical properties and good elasticity, strong hardness, wear resistance and chemical resistance. The polysiloxane-polyurea elastomer prepared with polysiloxane as the soft segment has both the excellent properties o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/65C08G18/61C08G18/32
CPCC08G18/61C08G18/6529
Inventor 张洁庞博
Owner SHANDONG UNIV
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