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One-component normal-temperature self-crosslinked fluorinated polyurethane coating material and preparation method thereof

A polyurethane coating and self-crosslinking technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of incomplete reaction, high price, environmental hazards, and difficulty in wide application, and achieve stable product performance and good solubility effect of ability

Inactive Publication Date: 2019-07-12
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluorine-containing raw material itself is expensive. When used as a bulk material, a large amount of fluorine components cannot migrate to the surface of the material, which is a waste of the use of fluorine materials. The cost of such a bulk material increases a lot, and it is difficult to be widely used; Coating materials can make full use of fluorine raw materials
In the usual two-component preparation method, it is inevitable that when the fluorine-containing component reacts with another component, the problem of insufficient reaction due to poor compatibility and uneven performance due to incomplete reaction
To solve this problem, we have to use expensive fluorinated solvents or toxic solvents such as DMF or DMSO that are more harmful to the environment, which not only increases the cost of use but also brings environmental pollution

Method used

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  • One-component normal-temperature self-crosslinked fluorinated polyurethane coating material and preparation method thereof
  • One-component normal-temperature self-crosslinked fluorinated polyurethane coating material and preparation method thereof
  • One-component normal-temperature self-crosslinked fluorinated polyurethane coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of Side Chain Fluorine-Containing Polyether Diol with Structural Formula Ⅲ Containing 6.2% Fluorine

[0032] 0.072 mol of 2-(tridecafluorohexyl) ethyl glycidyl ether and 1.128 mol of n-butyl glycidyl ether were dissolved in 50 mL of dichloromethane to form a dichloromethane mixed solution.

[0033] Then, in a 500mL kettle, after replacing the air in the kettle with pure nitrogen, cool down to 0°C, add 2.4mol tetrahydrofuran, 100mL dichloromethane, 0.072mol boron trifluoride ether and 0.216mol ethylene glycol, cool down to 0°C and stir After 20 minutes and maintaining the temperature, add the above-prepared dichloromethane mixed solution dropwise, and control the dropwise completion within 2 hours. Maintained at 0°C, reacted for 18h. Add 20ml of deionized water to terminate the reaction, distill off the solvent, and neutralize to neutral with sodium carbonate solution. Add 100mL deionized water to wash for 20min, and let stand to separate layers. The oil p...

Embodiment 2

[0038] Preparation of Side Chain Fluorinated Polyether Diol with Structural Formula IV Containing 12.2% Fluorine

[0039] 0.157 mol of 2-(tridetrifluorohexyl) ethyl glycidyl ether and 1.043 mol of n-butyl glycidyl ether were dissolved in 50 mL of dichloromethane to form a dichloromethane mixed solution.

[0040] In a 500mL kettle equipped with a stirrer, after replacing the air in the kettle with pure nitrogen, cool down to 0°C, add 100mL of dichloromethane as a solvent, add 2.4mol of tetrahydrofuran, 0.072mol of boron trifluoride ether and 0.216mol of ethylene dichloride alcohol. The dichloromethane mixed solution prepared above was added dropwise, and the controlled dropwise addition was completed within 5 hours. Keep at 0°C, react for 18 hours, add 60ml of deionized water to terminate the reaction, distill off the solvent, and neutralize to neutral with sodium bicarbonate solution. Add 200mL of deionized water, stir and wash with water for 20min, stand to separate and sep...

Embodiment 3

[0045] Preparation of Side Chain Fluorinated Polyether Diol with Structural Formula Ⅲ Containing 17.9% Fluorine

[0046] 0.255 mol of 2-(tridefluorohexyl) ethyl glycidyl ether and 0.945 mol of butyl glycidyl ether were dissolved in 50 mL of dichloromethane to form a dichloromethane mixed solution.

[0047] In a 500mL kettle equipped with a stirrer, after replacing the air in the kettle with pure nitrogen, cool down to 0°C and add 2.4mol tetrahydrofuran, 0.072mol boron trifluoride ether and 0.216mol 1,2-propanediol. The dichloromethane mixed solution prepared above was added dropwise, and the controlled dropwise addition was completed within 5 hours. Keep at 0°C, react for 18 hours, add 20ml of deionized water to terminate the reaction, distill off the solvent, and neutralize to neutral with sodium bicarbonate solution. Add 250 mL of deionized water, stir and wash with water for 20 min, stand to separate and separate, the oil phase is washed once again with distilled water, st...

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Abstract

The invention discloses a one-component normal-temperature self-crosslinked fluorinated polyurethane coating material, which has a molecular structure as shown in the structural formula I, wherein number-average molecular weight of the structural formula I is 3,000-20,000 g / mol; s is a number of a repeat unit of a hard segment part, and s is any natural number of 1-20; t is any natural number of 1-5; Rf(| wave) is fluorine-containing polyether glycol at the side chain of a soft segment; R1 is one of (A), (B), (C) or (D) in the structural formula II; R2 is one of (E), (F), (G), (H), (I) or (J)in the structural formula II; R3 is one of (K) or (L) in the structural formula II; and R4 is methyl or ethyl. The fluorinated polyurethane coating material has excellent performance, has good dissolving capacity in a nontoxic or low-toxicity solvent, and is environmentally-friendly. The product has stable performance and can be stored for a long time.

Description

technical field [0001] The invention belongs to the field of preparation and performance application of fluorine-containing polyurethane materials, and relates to a fluorine-containing polyurethane coating material and a preparation method, in particular to a single-component normal-temperature self-crosslinking fluorine-containing polyurethane coating material and a preparation method thereof. Background technique [0002] Polyurethane is a polymer material that can be freely designed by people to obtain specific properties. It is famous for its wide range of hardness, good wear resistance, high mechanical strength, various processing methods, and wide applicability. It has been used in aerospace, aerospace, It is widely used in many fields such as automobile industry, leather industry and paint industry. As a coating material, especially for outdoor use, its shortcomings of high water absorption, chemical corrosion resistance, light yellowing and degradation have affected ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/50C08G18/32C08G18/34C09D175/08
CPCC08G18/3206C08G18/348C08G18/5015C08G18/6692C09D175/08
Inventor 孔庆刚王静孔繁昕张龙
Owner NANJING UNIV OF INFORMATION SCI & TECH
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