High-strength high-toughness fluorine-containing polyurethane and preparation method thereof

A high-strength, high-toughness, polyurethane technology, applied in the field of high-strength, high-toughness fluorine-containing polyurethane and its preparation, can solve the problems of tensile strength and elongation at break to be improved, and achieve the goal of simple method, mild reaction conditions and great application prospects Effect

Active Publication Date: 2021-07-16
无锡氟越邦维新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tensile strength and elongation at break (i.e. toughness) of traditional fluorine-containing polyurethane materials still need to be improved

Method used

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  • High-strength high-toughness fluorine-containing polyurethane and preparation method thereof
  • High-strength high-toughness fluorine-containing polyurethane and preparation method thereof
  • High-strength high-toughness fluorine-containing polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation process of the high-strength and high-toughness fluorine-containing polyurethane in the present embodiment is as follows:

[0020] First, add 47g of polyoxypropylene glycol PPG with a molecular weight of 3000g / mol and 3g of hydroxyl-terminated liquid fluororubber with a molecular weight of 800g / mol into a four-necked flask, and vacuumize at 110°C for 2h to remove water.

[0021] Then, the temperature was lowered to 80°C, and 6g of isophorone diisocyanate IPDI, 0.1g of dibutyltin dilaurate, 20g of ethyl acetate and 10g of dimethyl sulfoxide were successively added to the four-necked flask, and nitrogen was blown. During the reaction, every Sampling was taken every half hour, and the change of the -NCO group peak was observed with an infrared spectrometer until the -NCO group no longer decreased, and an isocyanate-terminated fluorine-containing polyurethane prepolymer was obtained.

[0022] Then, 4.2 g of fluorodiol was dissolved in 2.1 g of dimethyl sulfo...

Embodiment 2

[0025] The preparation process of the high-strength and high-toughness fluorine-containing polyurethane in the present embodiment is as follows:

[0026] First, 45.5 g of polytetrahydrofuran ether glycol PTMG with a molecular weight of 2000 g / mol and 4.5 g of hydroxyl-terminated liquid fluororubber with a molecular weight of 800 g / mol were added to a four-necked flask, and the water was removed by vacuuming at 110°C for 2 hours.

[0027] Then, the temperature was lowered to 80°C, and 6g of hexamethylene diisocyanate HDI, 0.1g of dibutyltin dilaurate, 20g of ethyl acetate and 10g of dimethyl sulfoxide were successively added to the four-necked flask, and nitrogen was blown. During the reaction, every Sampling was taken every half hour, and the change of the -NCO group peak was observed with an infrared spectrometer until the -NCO group no longer decreased, and an isocyanate-terminated fluorine-containing polyurethane prepolymer was obtained.

[0028] Then, 1 g of 2,2,3,3-tetraf...

Embodiment 3

[0031] The preparation process of the high-strength and high-toughness fluorine-containing polyurethane in the present embodiment is as follows:

[0032] First, 47g of polyoxypropylene glycol PPG with a molecular weight of 3000g / mol and 3g of hydroxyl-terminated liquid fluororubber with a molecular weight of 800g / mol were added to a four-necked flask, and the water was removed by vacuuming at 110°C for 2h.

[0033] Then, the temperature was lowered to 80°C, and 8g perfluorotrimethylene diisocyanate, 0.1g dibutyltin dilaurate, 20g ethyl acetate and 10g dimethyl sulfoxide were successively added to the four-necked flask, and nitrogen was blown. During the reaction, every Sampling was taken every half hour, and the change of the -NCO group peak was observed with an infrared spectrometer until the -NCO group no longer decreased, and an isocyanate-terminated fluorine-containing polyurethane prepolymer was obtained.

[0034] Then, dissolve 1 g of fluorine-containing diamine in 0.5 g...

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Abstract

The invention discloses high-strength high-toughness fluorine-containing polyurethane and a preparation method thereof. The preparation method comprises the following steps: step 1, adding hydroxyl-terminated liquid fluorine rubber and low-molecular dihydric alcohol into a reaction container, vacuumizing and removing water; step 2, adding dropwise a mixture of isocyanate, dibutyltin dilaurate, ethyl acetate and dimethyl sulfoxide into the product obtained in the step 1 for a reaction to obtain a fluorine-containing polyurethane prepolymer, with the mass ratio of the product obtained in the step 1 to isocyanate to dibutyltin dilaurate to ethyl acetate to dimethyl sulfoxide being 50: (5-8): 0.1: 20: 10; step 3, dissolving a fluorine-containing micromolecule chain extender in trifluorotoluene, and adding the mixture into the product in the step 2 for reaction, with the mass ratio of the product obtained in the step 2 to the fluorine-containing chain extender to the benzotrifluoride being (85-88): (1-5): (0.5-2.5); and 4, dissolving the product in the step 3 in acetone, and reacting to obtain a pure product. According to the fluorine-containing polyurethane obtained by the invention, the tensile strength and the elongation at break are improved, and the hardness is reduced.

Description

technical field [0001] The invention relates to the field of polyurethane preparation, in particular to a high-strength and high-toughness fluorine-containing polyurethane and a preparation method thereof. Background technique [0002] Fluorine-containing polyurethane is a kind of polymer material with special functions. It has become a branch of polyurethane. Due to the introduction of fluorine, it not only maintains the original characteristics of polyurethane, but also endows it with excellent weather resistance, solvent resistance, and heat and humidity resistance. , aging resistance and other advantages, so it has great application prospects in the coating industry, leather decoration and medical and health industries. The tensile strength and elongation at break (that is, toughness) of traditional fluorine-containing polyurethane materials still need to be improved. Contents of the invention [0003] In order to improve the tensile strength and toughness of fluorine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/62C08G18/48C08G18/38C08G18/12
CPCC08G18/6666C08G18/4063C08G18/6279C08G18/4825C08G18/12C08G18/4854C08G18/6685C08G18/3812C08G18/3814
Inventor 邓超白永平胡桢
Owner 无锡氟越邦维新材料有限公司
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