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Preparation method of environment-friendly fluorine-containing waterborne polyurethane

A water-based polyurethane, environmentally friendly technology, applied in the field of water-based polyurethane, to avoid serious environmental pollution, enhance water and oil repellency, and increase density

Pending Publication Date: 2020-01-31
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the premise of maintaining product economy, how to improve the migration ability and crystallinity of short fluorine chain segments to significantly improve the surface properties of polyurethane is a problem that needs to be solved.
A general and effective method to enhance the potency of short fluorocarbon chains has not yet been developed

Method used

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  • Preparation method of environment-friendly fluorine-containing waterborne polyurethane
  • Preparation method of environment-friendly fluorine-containing waterborne polyurethane
  • Preparation method of environment-friendly fluorine-containing waterborne polyurethane

Examples

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preparation example Construction

[0035] A method for preparing an environment-friendly fluorine-containing water-based polyurethane, comprising the steps of: introducing two fluorine-containing side chains on each alkynyl group of an alkynyl-functionalized polyurethane through a mercapto-alkyne click chemical reaction to obtain a fluorine-containing side chain polyurethane; The fluorine-containing side chain polyurethane is emulsified to obtain an environment-friendly fluorine-containing water-based polyurethane; the number of carbon atoms in the fluorine-containing side chain of the fluorine-containing side chain polyurethane is less than 8.

[0036] One of the objectives of the present invention is to provide an environmentally friendly side chain fluorinated water-based polyurethane with water resistance and oil resistance, which can replace long fluorine segment polyurethane to play an environmental protection role, and by improving the migration ability and density of fluorine segment To endow polyurethan...

Embodiment 1

[0069] Firstly, 4,4′-dimethylol-1,4-heptadiyne (DPPD) was synthesized as a diol monomer for introducing alkynyl groups. First, add 150ml of absolute ethanol into a dry flask, and after blowing nitrogen gas, add 6.5g of freshly cut sodium filaments into the flask several times, and then add 20g of diethyl malonate after no hydrogen steam drum is generated. After uniform magnetic stirring, the temperature of the reaction system was raised to 60° C., and then 32.6 g of propargyl bromide was slowly added dropwise into the flask. After the dropwise addition, the system was kept under reflux for 12h. After removal of the solvent, precipitation in diethyl ether afforded a solid diethyl propargyl malonate intermediate. Next, 150ml of anhydrous THF was added into the flask, and the flask was placed in an ice bath under nitrogen protection. Then under magnetic stirring, 4.6g LiAlH 4 Slowly add it into the flask, stir evenly, dissolve 7.5g diethyl propargyl malonate in 50ml THF and dr...

Embodiment 2

[0074] This example is basically the same as Example 1, except that 0.9g of dimethylol propionic acid is replaced by 0.7g of diethylenetriamine. After mercapto-alkyne click chemistry, 0.8 g of triethylamine was replaced with 0.48 g of glacial acetic acid. After testing, the surface contact angle of the treated fabric is 120±5°, Figure 5 , The water absorption rate of the treated fabric is about 14%. According to the national standard GB-T 4745-1977, the water repellency level of the wet sample is rated as 5.

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Abstract

The invention discloses a preparation method of an environment-friendly fluorine-containing waterborne polyurethane. The preparation method comprises the following steps: introducing two fluorine-containing side chains to each alkynyl of alkynyl functionalized polyurethane through sulfydryl-alkyne click chemical reaction to obtain fluorine-containing side chain polyurethane, and emulsifying the fluorine-containing side chain polyurethane to obtain the environment-friendly fluorine-containing waterborne polyurethane, wherein the carbon atom number of the fluorine-containing side chain of the fluorine-containing side chain polyurethane is lower than 8. According to the invention, water is used as a solvent, and the preparation method has the characteristics of simple and efficient synthesissteps, no formaldehyde or benzene solvent is adopted, no biological accumulation is caused, and the environment-friendly fluorine-containing waterborne polyurethane is nontoxic; the environment-friendly fluorine-containing waterborne polyurethane disclosed by the invention is a multifunctional, green and environment-friendly waterproof and antifouling multifunctional coating and fabric finishing agent, and can be applied to the fields of aerospace, spinning, leather, packaging, buildings and the like.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane, and in particular relates to a preparation method of an environment-friendly fluorine-containing water-based polyurethane. Background technique [0002] The fluorine-containing side chain has the characteristics of small atomic radius, large electronegativity and low polarizability. When forming a covalent bond C-F with a carbon atom, the bond length of the covalent bond is small, the bond energy is large, the molecular structure is stable, and it has good thermal stability. stability and chemical stability. At the same time, because the fluorine-containing side chain nucleus has a strong binding effect on its extranuclear electrons and bonding electron cloud, the polarizability of the C-F bond is low, and the intermolecular force of the polymer containing the C-F bond is low, so the fluorine-containing polymer It has extremely low surface energy, excellent water resistance, oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/83C08G18/12C08G18/40C08G18/42C08G18/44C08G18/48C08G18/66C08G18/32C08G18/34D06M11/79D06M15/576
CPCC08G18/12C08G18/4018C08G18/4277C08G18/44C08G18/4825C08G18/4854C08G18/6618C08G18/6625C08G18/835D06M11/79D06M15/576D06M2200/11D06M2200/12C08G18/3206C08G18/348C08G18/3228
Inventor 李兴建
Owner LINYI UNIVERSITY
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