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Hydroxyl silicone oil modified waterborne polyurethane coating with coating film with high tensile strength and high water resistance

A high tensile strength, water-based polyurethane technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of sticky surface, low water and alkali resistance, etc., and achieve the effect of strong tensile strength

Pending Publication Date: 2022-04-22
JIANGSU INSTITUTE OF EDUCATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the above problems, the present invention discloses a water-based polyurethane coating modified with high tensile strength and high water resistance and its preparation process, so as to solve the above problems of low tensile strength, low water and alkali resistance and Problems such as surface stickiness

Method used

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  • Hydroxyl silicone oil modified waterborne polyurethane coating with coating film with high tensile strength and high water resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 13.33 parts of polyether diol PTMG2000, 12 parts of polyether diol PTMG3000, 42 parts of polyester polyol 410, and 1.33 parts of IM11 hydroxyl silicone oil in a four-necked flask, start stirring, heat up to 60°C and keep it warm for 30 Minutes, then add 42.25 parts of IPDI, keep warm and heat to 70°C, keep warm for 30 minutes, then add 10.7 parts of DMPA, keep warm for 30 minutes, heat up to 80°C, keep for 30 minutes, after the reaction reaches 2.8% of the theoretical value, cool down When the polymer is cooled to 60°C, add 30 parts of acetone to dilute, cool to 30°C, add 11 parts of neutralizing agent triethylamine, form salt for 15 minutes, finally add a mixture of 195 parts of deionized water and 2.1 parts of hydrazine hydrate, stir and disperse After 30 minutes, the aqueous polyurethane dispersion emulsion modified by hydroxyl silicone oil was obtained.

Embodiment 2

[0026] Weigh 13.33 parts of polyether diol PTMG2000, 12 parts of polyether diol PTMG3000, 42 parts of polyester polyol 410, 2.4 parts of IM22 hydroxyl silicone oil in a four-necked flask, start stirring, heat up to 60°C and keep it warm for 30 Minutes, then add 42.25 parts of IPDI, keep warm and heat to 70°C, keep warm for 30 minutes, then add 10.7 parts of DMPA, keep warm for 30 minutes, heat up to 80°C, keep for 30 minutes, after the reaction reaches 2.7% of the theoretical value, cool down When the polymer is cooled to 60°C, add 30 parts of acetone to dilute, cool to 30°C, add 11 parts of neutralizing agent triethylamine, form salt for 15 minutes, finally add a mixture of 203 parts of deionized water and 2.03 parts of hydrazine hydrate, stir and disperse After 30 minutes, the aqueous polyurethane dispersion emulsion modified by hydroxyl silicone oil was obtained.

Embodiment 3

[0028] Weigh 13.33 parts of polyether diol PTMG2000, 12 parts of polyether diol PTMG3000, 42 parts of polyester polyol 410, and 6 parts of SLM88713 hydroxyl silicone oil in a four-necked flask, start stirring, heat up to 60 ° C and keep it warm for 30 Minutes, then add 42.25 parts of IPDI, keep warm and heat to 70 ℃, keep warm for 30 minutes, then add 10.7 parts of DMPA, keep warm for 30 minutes, heat up to 80 ℃, keep for 30 minutes, after the reaction reaches 3.0% of theoretical value, cool down When the polymer is cooled to 60 °C, add 30 parts of acetone to dilute, cool to 30 °C, add 11 parts of neutralizing agent triethylamine, salt for 15 minutes, finally add a mixture of 215.3 parts of deionized water and 2.3 parts of hydrazine hydrate, stir and disperse After 30 minutes, the aqueous polyurethane dispersion emulsion modified by hydroxyl silicone oil was obtained.

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Abstract

The hydroxyl silicone oil modified waterborne polyurethane coating with the coating film with high tensile strength and high water resistance is prepared from the following components in parts by weight: 25.33 to 32.57 parts of polyether polyol, 30 to 42 parts of polyester polyol, 0.89 to 6 parts of hydroxyl silicone oil, 37.62 to 42.25 parts of isocyanate, 4.4 to 10.7 parts of a hydrophilic chain extender, 25 to 35 parts of a viscosity reduction solvent, 4.32 to 11 parts of a neutralizing agent, 2 to 2.3 parts of a post chain extender and 191 to 215.3 parts of deionized water. Compared with a comparison process without adding the hydroxyl silicone oil, the addition of the hydroxyl silicone oil can reduce the surface energy of the waterborne polyurethane film, and the surface of the film has no sticky phenomenon, so that the flexibility of the polyurethane film is high, and the water resistance is obviously enhanced; due to the characteristic of high bond energy of silicon-oxygen bonds and existence of hydrogen-bond interaction between molecular chains, the tensile strength of the film is remarkably improved under multiple actions; meanwhile, the characteristics of full hand feeling and comfort are met, and a series of performances of leather and textile fabrics are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane emulsion synthesis, in particular to a hydroxyl silicone oil-modified water-based polyurethane coating with high tensile strength and high water resistance coating film. Background technique [0002] Polyurethane (PU for short) is a kind of polymer compound containing carbamate (-NHCOO-) repeating structural units in the main chain. Since its invention, polyurethane has become a polymer material with a wide range of uses, and can be made into products of various shapes. It is a "cuttable" and "universal" polymer. [0003] Water-based polyurethane is polycondensed by isocyanate and diol, etc. to form a prepolymer with -NCO at both ends, and then use a diamine containing a hydrophilic acidic group as a chain extender to embed it on the polyurethane molecular chain; Depending on the number of raw material functional groups used in the reaction, it can be made into a linear or bulk s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C08G18/12C08G18/48C08G18/61C08G18/66C08G18/34C08G18/32
CPCC09D175/04C08G18/4018C08G18/4854C08G18/61C08G18/6625C08G18/12C08G18/348C08G18/3231
Inventor 姜大炜黄斌冯燕顾小敏钮珊珊成忠权郭琦
Owner JIANGSU INSTITUTE OF EDUCATION