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A kind of preparation method of fluorine-containing polyurethane leather waterproof coating

A polyurethane leather, waterproof coating technology, applied in leather surface treatment, small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. The problems of biological toxicity and environmental pollution of fluorine water repellant have achieved remarkable solvent resistance, easy large-scale production, and simple and practical preparation process.

Active Publication Date: 2022-08-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for preparing a fluorine-containing polyurethane waterproof coating by introducing a short-chain branched fluorine-containing alcohol to solve the problems that the current long-chain fluorine-containing waterproofing agent has potential biological toxicity, pollutes the environment, and faces prohibition.

Method used

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  • A kind of preparation method of fluorine-containing polyurethane leather waterproof coating
  • A kind of preparation method of fluorine-containing polyurethane leather waterproof coating
  • A kind of preparation method of fluorine-containing polyurethane leather waterproof coating

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Embodiment 1

[0032] In this embodiment, TDI is selected as the isocyanate, 1,4-butanediol (BDO) is selected as the chain extender, ethanol is selected as the fluorine-free monomer, and the preparation method of the fluorine-containing polyurethane waterproof coating is carried out according to the following steps:

[0033] (1) Preparation of ethanol / FA-terminated FPU solution

[0034] BDO (1g) and TDI (4g) were heated to 60°C in 15g DMF and reacted for 1.5 hours, then the system was heated to 70°C. After the temperature was reached, 2g FA was added under nitrogen protection, and the reaction was continued for 2 hours. After cooling to 60° C., 1 g of ethanol was added, and the reaction was carried out for 1 hour to obtain a FPU solution.

[0035] (2) Preparation of FPU waterproof coating

[0036] Dip a small amount of FPU solution with a glass rod and coat it on leather (artificial leather, the specific material is PU), coat 1-5 ml per 13 square centimeters of substrate, and place it in a ...

Embodiment 2

[0042] In this embodiment, TDI is selected as the isocyanate, 1,4-butanediol (BDO) is selected as the chain extender, n-octanol is selected as the fluorine-free monomer, and the preparation method of the fluorine-containing polyurethane waterproof coating is carried out according to the following steps:

[0043](1) Preparation of n-octanol / FA-terminated FPU solution

[0044] BDO (1g) and TDI (4g) were heated to 60°C in 15g DMF and reacted for 1.5 hours, then the system was heated to 70°C. After the temperature was reached, 2g FA was added under nitrogen protection, and the reaction was continued for 2 hours. After cooling to 60° C., 1.2 g of n-octanol was added and reacted for 1 hour to obtain an FPU solution.

[0045] (2) Preparation of FPU waterproof coating

[0046] Dip a small amount of FPU solution with a glass rod and coat it on leather (artificial leather, the specific material is PU), coat 1-5 ml per 13 square centimeters of substrate, and place it in a 130° oven for ...

Embodiment 3

[0048] In this embodiment, TDI is selected as the isocyanate, 1,4-butanediol (BDO) is selected as the chain extender, n-heptanol is selected as the fluorine-free monomer, and the preparation method of the fluorine-containing polyurethane waterproof coating is carried out according to the following steps:

[0049] (1) Preparation of n-heptanol / FA-terminated FPU solution

[0050] BDO (1g) and TDI (4g) were heated to 60°C in 15g DMF and reacted for 1.5 hours, then the system was heated to 70°C. After the temperature was reached, 2g FA was added under nitrogen protection, and the reaction was continued for 2 hours. After cooling to 60° C., 1.5 g of n-heptanol was added, and the reaction was carried out for 1 hour to obtain a FPU solution.

[0051] (2) Preparation of FPU waterproof coating

[0052] Dip a small amount of FPU solution with a glass rod and coat it on leather (artificial leather, the specific material is PU), coat 1-5 ml per 13 square centimeters of substrate, and pla...

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Abstract

The present invention is a preparation method of fluorine-containing polyurethane leather waterproof coating. The method includes the following steps: heating the chain extender and isocyanate in N,N-dimethylformamide to 50-70°C, then reacting, heating the system to 70-90°C, adding short-chain branched fluoroalcohol (FA) , after the reaction, the system is cooled to 40-60 ℃, then the fluorine-free monomer is added, and the reaction is continued to obtain a fluorine-containing polyurethane solution; the obtained fluorine-containing polyurethane solution is coated on leather, and dried to obtain a fluorine-containing polyurethane waterproof coating . The present invention can realize the effect of the long-chain C8 leather waterproofing agent and overcome the disadvantage that it cannot be degraded.

Description

technical field [0001] The invention belongs to the field of waterproof coatings, in particular to a preparation method of a fluorine-containing polyurethane leather waterproof coating. Background technique: [0002] At present, the application of leather is very extensive, but the shortcomings such as easy aging of leather, poor water resistance and scratch resistance limit its development. The main way to improve the performance of leather is to coat a protective film on its surface. Common coatings can be roughly divided into three categories: polyurethane, polyacrylate and silicone. Among them, polyurethanes are used earlier and are the most developed due to their strong structural designability and high wear resistance, and have been widely used in leather waterproofing. In order to further improve the waterproof, oil resistance and antifouling properties of polyurethane coatings, fluorine-containing polyurethane (FPU) is usually prepared by introducing fluorine-contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/32C08G18/28C08G18/61C08G18/10C14C11/00
CPCC08G18/3206C08G18/10C08G18/6775C08G18/282C08G18/2865C08G18/289C14C11/006
Inventor 潘明旺苏守花晋心文袁金凤张广林
Owner HEBEI UNIV OF TECH
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