Normal-temperature cured water-based polyurethane and preparation method and application thereof

A water-based polyurethane, room temperature curing technology, used in polyurea/polyurethane coatings, antifouling/underwater coatings, coatings, etc., can solve the problems of high curing temperature, harsh curing conditions, insufficient mechanical properties, etc. The effect of high stain resistance, not harsh process conditions, and simple preparation method

Inactive Publication Date: 2016-12-07
CHENGDU KAITE ORGANOSILICON NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the preparation process of most polyurethane resins, the increase of the viscosity of the reaction system affects the polymerization stirring and the molecular weight of the polymer, so a certain amount of organic solvents such as acetone and butanone must be added for dilution. In the subsequent process, although it can be However, the process, equipment and cost will increase, and the recycling of organic solvents will also cause certain environmental pollution, and the environmental protection standards cannot meet the international environmental protection requirements.
Moreover, the traditional water-based polyurethane coatings containing the above polyurethane resins mostly have the disadvantages of high curing conditions, energy consumption, slow curing speed of the coating film, poor water resistance, and insufficient mechanical properties.
[0004] Chinese patent application number CN102618672A proposes a preparation method of a fluorine-containing leather protective agent. Although the treated leather has good waterproof, oil-proof and antifouling properties, its curing temperature is relatively high and cannot be cured at room temperature. Chinese patent "water-based polyurethane-a

Method used

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  • Normal-temperature cured water-based polyurethane and preparation method and application thereof
  • Normal-temperature cured water-based polyurethane and preparation method and application thereof
  • Normal-temperature cured water-based polyurethane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] A waterborne polyurethane cured at room temperature, which is characterized in that it comprises the following components, in mass percentage:

[0030] N210 polyether 10%, fluorinated glycol 1%, toluene diisocyanate 20%, anti-mold fungicide dimethyl fumarate 25%, acetone 20%, molecular weight regulator 5%, fluorinated hydroxy acrylic acid Lipid monomer 2%, 2-hydroxypropyl methacrylate: 2%, chain extender 5%, neutralizer 9%, coupling agent 1%;

[0031] The molecular weight regulator is a mixture of tert-butyl mercaptan and 1,4-butanediol, in which tert-butyl mercaptan is 3% and 1,4-butanediol is 2%.

[0032] The preparation method includes the following steps:

[0033] (1) Add N210 polyether and fluorinated diol as the bottom material into the reaction kettle, and add 85% phosphoric acid which accounts for 2% of the total mass of non-aqueous substances; then add toluene diisocyanate at room temperature and increase the temperature. To 70℃, constant temperature...

Example Embodiment

[0038] Example 2

[0039] A waterborne polyurethane cured at room temperature, which is characterized in that it comprises the following components, in mass percentage:

[0040] N220 polyether 20%, fluorinated diol 2%, hexamethylene diisocyanate 10%, anti-mold fungicide dimethyl fumarate 10%, isopropanol 40%, molecular weight regulator 1%, fluorine-containing Hydroxy acrylate monomer 3%, 2-hydroxypropyl methacrylate 5%, chain extender 7.9%, neutralizer 1%, coupling agent 0.1%;

[0041] The molecular weight regulator is tert-butyl mercaptan.

[0042] The preparation method includes the following steps:

[0043] (1) Add N220 polyether and fluorinated diol as bottom materials into the reaction kettle, add dropwise 85% phosphoric acid, which accounts for 0.1% of the total mass of non-aqueous substances; then add hexamethylene diisocyanate at room temperature and increase the temperature to 70°C , Constant temperature reaction 2h;

[0044] (2) Add the organotin catalyst which accounts for 0...

Example Embodiment

[0048] Example 3

[0049] A waterborne polyurethane cured at room temperature, which is characterized in that it comprises the following components, in mass percentage:

[0050] N330 polyether 30%, fluorinated glycol 2%, toluene diisocyanate 5%, anti-mold fungicide dimethyl fumarate 20%, acetone 20%, molecular weight regulator 2%, fluorinated hydroxyl acrylate monomer 2%, 2-hydroxypropyl methacrylate 4%, chain extender 2%, neutralizer 4.5%, coupling agent 0.5%;

[0051] Wherein the molecular weight regulator is a polyester diol with a relative molecular weight of 400-1000;

[0052] The preparation method includes the following steps:

[0053] (1) Add N330 polyether and fluorinated diol as bottom materials into the reaction kettle, drop 85% phosphoric acid, which accounts for 0.05% of the total mass of non-aqueous substances; then add toluene diisocyanate at room temperature, heat up to 70°C, and react at constant temperature 4h;

[0054] (2) Add 0.1% of the total mass of non-aqueous su...

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Abstract

The invention discloses normal-temperature cured water-based polyurethane and a preparation method and application thereof. The polyurethane is prepared from polyether polyol, fluoride glycol, polyisocyanate, anti-mildew bactericide dimethyl fumarate, diluent, molecular weight modifier, fluorine-containing hydroxyl acrylate monomer, methacrylic acid-2-hydroxypropyl ester, chain extender, neutralizer and coupling agent. By means of the addition polymerization mode of unsaturated double bond containing polyether polyol, polyalkoxy silicon base and fluorine-containing hydroxyl acrylate are chemically bonded into polyurethane chains, novel water-soluble polyurethane resin of a polyalkoxy silicon base fluoro modified acrylic resin-polyurethane interpenetrating polymer networks (IPN) structure is synthesized and is made to have the common advantages of water-based polyurethane paint and polyacrylate emulsion, and the polyurethane is cured at normal temperature, has oil resistance and stain resistance, is suitable for waterproof and anti-foul coating on surface layers of leather, plastic, wood, metal, external walls and the like, and is environmentally friendly, high in industrial practicability and high in economic benefit.

Description

Technical field [0001] The invention relates to the field of preparation methods of waterborne polyurethane coatings, in particular to a preparation method and application of a normal temperature curing fluorine-containing hydroxy acrylate modified polyalkoxy silicon-based anionic and cationic waterborne polyurethane. Background technique [0002] The polymer chain of waterborne polyurethane can make the waterborne polyurethane resin have a variety of functions: water resistance, solvent resistance, abrasion resistance, scratch resistance, air permeability and hand feel are stronger than solvent-based polyurethane resin. Coatings containing water-soluble polyurethane resins are used in the waterproof and antifouling of leather products and plastic surfaces. Not only can the chemical properties meet the international environmental protection standards, but also the physical properties can greatly improve the coating performance. [0003] At present, in the preparation process of mos...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/66C08G18/61C08G18/48C08G18/32C08G18/34C09D175/14C09D5/16C09D7/12
CPCC08G18/672C08G18/348C08G18/3812C08G18/61C09D5/1662C09D175/14C08G18/6666C08G18/48
Inventor 阳庆文王雪梅帅晓强蓝华强赵志明
Owner CHENGDU KAITE ORGANOSILICON NEW MATERIALS TECH
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