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Polyester type polyurethane material with side chain containing fluorine and preparation method thereof

A polyurethane material and fluorine-containing polyester technology, which is applied in the field of side chain fluorine-containing polyurethane elastomer materials and its preparation, can solve the problems of poor compatibility of perfluorinated soft segments, modification of surface hydrophobicity, and increased difficulty of synthesis process, etc. , to achieve the effects of reducing the intermolecular force of the main chain polarity, enhancing the penetration resistance, excellent wear resistance and stain resistance and hydrophobicity

Inactive Publication Date: 2012-08-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modification of the surface hydrophobicity of the fluorinated polyurethane synthesized by this semifluorinated polyether is not significant, because in the case of using the perfluorosoft segment, the perfluorosoft segment is compatible with other monomers Poor properties lead to a heterogeneous system in the prepolymerization reaction, which increases the difficulty of the synthesis process

Method used

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  • Polyester type polyurethane material with side chain containing fluorine and preparation method thereof
  • Polyester type polyurethane material with side chain containing fluorine and preparation method thereof
  • Polyester type polyurethane material with side chain containing fluorine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment one, five, seven, comparative example 1, 2

[0064] These five examples all use a one-step bulk polymerization process.

[0065] First, add polyester diol into a reaction kettle equipped with a stirrer, a thermometer, and a vacuum device, stir and heat up to 80~100°C, and vacuum degassing for 30~60 minutes under stirring conditions, then cool down to 50~70°C ℃; Secondly, if there is a catalyst in the formula, add the catalyst, add the chain extender and diisocyanate in turn under the protection of nitrogen, stir and heat up to 100°C for 3~20 minutes; then transfer the reaction mixture to PTFE preheated at 100°C In a vinyl tray, post-cure in an oven at 100-120°C for 3-6 hours, cool down, and demould to get the product. The formula of each embodiment raw material monomer is shown in Table 1.

Embodiment 3

[0066] Embodiment three, six, ten, comparative example 3

[0067] These four examples all employ a two-step bulk polymerization process.

[0068] First, add polyester diol into a reaction kettle equipped with a stirrer, a thermometer, and a vacuum device, stir and heat up to 80~100°C, and then cool down to 50~70°C after vacuum degassing for 30~60 minutes under stirring conditions; Secondly, if there is a catalyst in the formula, add the catalyst, and add diisocyanate to react for 5-60 minutes at the same time, measure the content of isocyanate during the reaction, add chain extender when the isocyanate drops to the theoretical amount, or add the chain extender when the isocyanate is not mixed with Add the chain extender when the hydroxyl group of the polyester diol is completely reacted, continue to stir and heat up to 100~110°C, and react for 3~20 minutes; then transfer the reaction mixture to a preheated polytetrafluoroethylene tray at 100°C, Post-curing in oven at ~120°C f...

Embodiment 2

[0069] Embodiment two, nine, comparative example 3

[0070] All three examples employ a two-step solution polymerization process.

[0071] First, add solvent and polyester diol in sequence in a reaction kettle equipped with a stirrer, a thermometer, and a reflux device, stir, heat up to 50~80°C, and fully dissolve; secondly, if there is a catalyst in the formula, add the catalyst and stir fully until Completely dissolve; then add diisocyanate to react for 5-60 minutes, measure the content of isocyanate during the reaction, add chain extender when the isocyanate drops to the theoretical amount, or when the isocyanate is not combined with the hydroxyl group of polyester diol When the reaction is complete, add the chain extender; after adding the chain extender, react for 3 to 6 hours, stop stirring, and cool to obtain a polyurethane solution with a solid content of about 20%. The solvent used in Example 2 is DMAc, and the solvent used in Example 9 is difluorotetrachloroethane / / ...

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Abstract

The invention provides a polyurethane material with a side chain containing fluorine, which is formed by copolymerizing a flexible chain section formed by common commercial polyester dibasic alcohol and a rigid chain section formed by diisocyanate and a chain extender, and is characterized in that the chain extender is dihydric alcohol with a side chain containing a perfluor alkyl group or mixture formed by the dihydric alcohol with the side chain containing the perfluor alkyl group and other low-molecule dihydric alcohol or diamine. The invention further provides a preparation method of the polyurethane material with the side chain containing the fluorine. Due to the fact that the chain extender is connected onto a polyurethane main chain (hard section) in a side chain mode, the movement of a fluorocarbon side chain is hardly limited by the polyurethane main chain while the fluorocarbon side chain can remarkably change a phase structure of the polyurethane (separation degree of a soft section and the hard section), and the novel polyurethane material is provided with good surface performance and body performance.

Description

Technical field [0001] The present invention is a polyurethane elastic body and its preparation technology field, which involves a side chain containing fluorine polyurethane elastic material and its preparation methods. Background technique [0002] Polyurethane is the abbreviation of polystamate. Any polymer compound that contains many duplicate aminate groups on the main chain of the polymer main chain is generally referred to as polythamine.Polyester), organic polytyorne essence and small molecule expansion agent (diol or polyamine) are polymerized, which is an embedded polymer.Generally, long chain binary glycols are soft and form a soft segment, while the hard segments are composed of polytyornes and chain expansion agents.In the molecular chain, the soft segment and the hard segment alternately alternately form the embedded segment structure. Due to the incompatibility of the thermodynamics of the soft segment and the hard segment, there is a separation of polyurethane pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32
Inventor 谭鸿李洁华张恒宁傅强
Owner SICHUAN UNIV
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