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Preparation method of polydimethylsiloxane (PDMS) modified polyurethane-imides (PUI) hybrid material

A polydimethylsiloxane and hybrid material technology, applied in the direction of coating, etc., can solve the problems of low mechanical strength, easy to be corroded, unable to withstand high intensity of ultraviolet rays and long-term irradiation, etc., and achieve a simple and easy preparation process. easy to industrialize, easy to apply on a large scale

Inactive Publication Date: 2014-02-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In terms of UV resistance and atomic oxygen corrosion resistance, the polyurethane segment in poly(urethaneimide) has certain UV resistance but poor atomic oxygen oxidation resistance, and cannot withstand high-intensity and long-term exposure to ultraviolet rays.
The imide segment has good UV resistance but is easily corroded in the presence of atomic oxygen
Although silicone resin has good performance in high and low temperature resistance, ultraviolet and infrared radiation resistance, oxidative degradation resistance, electrical insulation and elasticity, silicone resin has poor compatibility with other organic materials, poor adhesion, The mechanical strength is low and high pressure molding is required for preparation, etc.

Method used

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  • Preparation method of polydimethylsiloxane (PDMS) modified polyurethane-imides (PUI) hybrid material
  • Preparation method of polydimethylsiloxane (PDMS) modified polyurethane-imides (PUI) hybrid material
  • Preparation method of polydimethylsiloxane (PDMS) modified polyurethane-imides (PUI) hybrid material

Examples

Experimental program
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example 1

[0021] (1) Synthesis of polydimethylsiloxane-modified poly(urethane-imide) PDMS-PUI prepolymer. Add 25.5g of isophorone diisocyanate into a 250ml three-necked flask and stir, protect with nitrogen, drop 0.2g of the toluene solution (wt=20%) of the catalyst dibutyltin dilaurate, and raise the temperature to 50°C for the catalyst dilaurate Dibutyltin was activated for 20 minutes; then 53.64g of dehydrated hydroxyalkyl-terminated polydimethylsiloxane was added dropwise to the system, and after reacting at 70°C for 4 hours, a small amount was taken out to measure the infrared spectrum. The disappearance of the hydroxyl group indicated that the reaction was complete. Its infrared absorption characterization data is attached figure 1 Shown: FTIR (cm-1, KBr) 2263 (v-NCO), 3323 (vN-H), 3490 (-OH), 1100, 1020 (Si-O-Si).

[0022] (2) Lower the temperature of the above system to 60°C, add 6.26g of pyromellitic anhydride to the system, then add 75ml of N,N'-dimethylformamide dropwise to ...

example 2

[0028] (1) Synthesis of polydimethylsiloxane-modified poly(urethane-imide) PDMS-PUI prepolymer. Add 25.5g of isophorone diisocyanate into a 250ml three-necked flask and stir, protect with nitrogen, drop 0.3g of the toluene solution (wt=20%) of the catalyst dibutyltin dilaurate, and raise the temperature to 50°C for the catalyst dilaurate Dibutyltin was activated for 20 minutes; then 53.64g of dehydrated hydroxyalkyl-terminated polydimethylsiloxane was added dropwise to the system, reacted at 70°C for 4 hours, and a small amount was taken out for infrared spectroscopy. The disappearance of hydroxyl groups indicated that the reaction was complete. Its infrared absorption characterization data is attached figure 1 Shown: FTIR (cm-1, KBr) 2263 (v-NCO), 3323 (vN-H), 3490 (-OH), 1100, 1020 (Si-O-Si).

[0029] (2) Cool the above system to 50°C, add 6.26g of pyromellitic anhydride to the system, then add 75ml of N,N'-dimethylformamide dropwise to the system, and add 0.3g of catalyst ...

example 3

[0035] (1) Synthesis of polydimethylsiloxane-modified poly(urethane-imide) PDMS-PUI prepolymer. Add 25.5g of isophorone diisocyanate into a 250ml three-necked flask and stir, protect with nitrogen, drop 0.3g of the toluene solution (wt=20%) of the catalyst dibutyltin dilaurate, and raise the temperature to 50°C for the catalyst dilaurate Dibutyltin was activated for 20 minutes; then 53.64g of polydimethylsiloxane capped with dehydrated hydroxyalkyl groups was added dropwise to the system, and after reacting at 70°C for 4 hours, a small amount was taken out to measure the infrared spectrum. The disappearance of the hydroxyl group indicated that the reaction was complete. Its infrared absorption characterization data is attached figure 1 Shown: FTIR (cm-1, KBr) 2263 (v-NCO), 3323 (vN-H), 3490 (-OH), 1100, 1020 (Si-O-Si).

[0036] (2) Cool the above system to 40°C, add 6.26g of pyromellitic anhydride to the system, then add 75ml of N,N'-dimethylformamide dropwise to the system, ...

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Abstract

The invention relates to a preparation method of a PDMS modified PUI hybrid material. The preparation method is characterized in that the preparation method comprises the following steps: 1, synthesizing a PDMS modified PUI perpolymer from raw materials comprising hydroxyalkyl terminated PDMS, specially structured diisocyanate and phthalic anhydride, mixing with polyhedral oligomeric silsesquioxane (POSS) and a curing agent, and curing at room temperature to obtain the hybrid material. The prepared material has the advantages of very good ultraviolet radiation and corrosion resistances, excellent heatproof performance and excellent mechanical performance, and can be used as an ultraviolet radiation and corrosion resistant protection material of spacecrafts. The preparation method has the advantages of simple reaction step and strong maneuverability, and is suitable for industrial production.

Description

Technical field: [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing a polydimethylsiloxane-modified poly(urethane-imide) hybrid material. Background technique: [0002] Poly(urethane-imides) (Polyurethane-imides referred to as PUI) is a type of polymer that contains both polyurethane soft segment structure and imide hard segment structure in the molecular chain. PUI has the excellent properties of PU and PI, such as good mechanical properties, thermal stability, electrical insulation properties, chemical corrosion resistance, radiation resistance, wear resistance and so on. [0003] Polysiloxane (silicones) is the most common organosilicon polymer. It is a polymer with a stable skeleton composed of silicon atoms and oxygen atoms alternately. Its basic structural unit is -Si-O-, and its main chain -Si-O -Si- belongs to "inorganic structure". The bond energy of Si-O bond is 462.0kJ / mol, much higher than the bond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08G73/10C08G18/61C08G18/10C08K5/549C09D179/08C09D7/12
Inventor 李齐方董伟杰
Owner BEIJING UNIV OF CHEM TECH
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