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A kind of preparation method of cationic waterborne polythiourethane

A polythiourethane, cationic technology, applied in the field of water-based polyurethane, can solve the problem of no cationic water-based polythiourethane preparation, etc., to achieve the effect of good mechanical properties, good environmental protection, and excellent bonding performance

Active Publication Date: 2018-06-26
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Through the analysis and research of the existing published related patents, the papers and patents involved are limited to the development of polythiourethane sealants, the compound components and synthesis methods used for polythiourethane resin lenses, and the research on catalysts for their synthesis Preparation method, there is no report on the preparation of cationic water-based polythiourethane

Method used

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  • A kind of preparation method of cationic waterborne polythiourethane
  • A kind of preparation method of cationic waterborne polythiourethane
  • A kind of preparation method of cationic waterborne polythiourethane

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Embodiment 1

[0048] A kind of preparation method of cationic waterborne polythiourethane that the present invention proposes, comprises the steps:

[0049] S1. Add 58.1g of isophorone diisocyanate to 14.3g of liquid polysulfide rubber LP3 and 36.5g of polyoxypropylene diol mixed solution with a number average molecular weight of 1000 after vacuum dehydration at 110°C for 1 hour, and fill it with dry nitrogen to carry out Protect, heat up to 95°C, and keep warm for 180min to obtain the isocyanate-terminated polysulfide-modified polyurethane prepolymer;

[0050] S2. Cool the isocyanate-terminated polysulfide-modified polyurethane prepolymer to 40°C, then add 15.5g of diethylene glycol, 0.95g of trimethylolpropane, 0.1g of stannous octoate, and 0.12g of dilaurate Butyl tin and 20mL acetone, heat up to 80°C, keep warm for 150min, cool down to 35°C, then slowly add dropwise a mixed solution of 6.8g N-methyldiethanolamine and 15mL acetone, keep the temperature at 50°C, keep warm for 90min, then ...

Embodiment 2

[0053] A kind of preparation method of cationic waterborne polythiourethane that the present invention proposes, comprises the steps:

[0054] S1. Add 58.1g of isophorone diisocyanate to 50g of liquid polysulfide rubber LP3 that has been vacuum dehydrated at 110°C for 1 hour, fill it with dry nitrogen for protection, raise the temperature to 95°C, and keep it warm for 180min to obtain polysulfide modified with terminal isocyanate groups. Polyurethane prepolymer;

[0055] S2. Cool the isocyanate-terminated polysulfide-modified polyurethane prepolymer to 40°C, then add 14.6g of dipropylene glycol, 0.9g of glycerin, 0.11g of stannous octoate, 0.12g of dibutyltin dilaurate and 25mL of acetone, Heat up to 80°C, keep it warm for 150min, cool down to 35°C, then slowly add a mixed solution of 6.9g N-methyldiethanolamine and 15mL of acetone dropwise, keep the temperature at 50°C, keep it warm for 90min, then add 40mL of acetone to reduce the viscosity to obtain isocyanate Polysulfide-...

Embodiment 3

[0058] A kind of preparation method of cationic waterborne polythiourethane that the present invention proposes, comprises the steps:

[0059] S1. Add 45.1g of dicyclohexylmethane diisocyanate to 10g of liquid polysulfide rubber LP3, 12.3g of polytetrahydrofuran ether diol with a number average molecular weight of 2000 and 16.21g of polytetrahydrofuran ether glycol with a number average molecular weight of 2000 after vacuum dehydration at 110°C for 1.5h. Fill the ethylene adipate diol mixed solution with dry nitrogen for protection, raise the temperature to 95°C, and keep it warm for 120 minutes to obtain the isocyanate-terminated polysulfide-modified polyurethane prepolymer;

[0060] S2. Cool the isocyanate-terminated polysulfide-modified polyurethane prepolymer to 40°C, then add 10.2g of ethylene glycol, 0.65g of triethanolamine, 0.07g of stannous octoate, 0.08g of dibutyltin dilaurate and 25mL of acetone, Raise the temperature to 80°C, keep it warm for 120min, cool down to ...

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Abstract

The invention discloses a method for preparing cationic waterborne polythiourethane, comprising the following steps: mixing liquid polysulfide rubber and isocyanate, and reacting to synthesize isocyanate-terminated polysulfide modified polyurethane prepolymer; subjecting the isocyanate-terminated polysulfide modified polyurethane prepolymer to chain extension reaction with a small-molecule chain extender, a cationic hydrophilic chain extender and a crosslinking agent to obtain isocyanate polysulfide modified polyurethane; emulsifying the isocyanate polysulfide modified polyurethane to obtain cationic waterborne polythiourethane dispersion. The cationic waterborne polythiourethane resin obtained herein can be used with acidic and neutral resins, is high in strength, wear resistance and adhesion, is excellent in flexibility and compactness, is resistant to high and low temperatures, ageing, ozone and oil, is low in moisture and air permeability, can be attached to negatively charged base material, can form a 'sandwich' structure with a cationic system, and is widely applicable in the fabric coating field, the glue field, the anticorrosive paint field and other fields.

Description

technical field [0001] The invention relates to the technical field of waterborne polyurethane, in particular to a preparation method of cationic waterborne polythiourethane. Background technique [0002] Water-based polyurethane is a kind of polymer material that can be dissolved in water or evenly dispersed in water. Because it uses water as the dispersion medium and has zero VOC emissions, it has been recognized by the environment; because of its excellent performance, it has been widely used in printing, textiles, etc. Finishing, leather finishing and other industries. [0003] The main chain of polysulfide molecule contains sulfur atoms, and the shrinkage of the vulcanized product is very small. The sealant made of it has good adhesion to various adherends, good ozone resistance, weather resistance, oil resistance, and moisture and gas permeability. Low resistance, especially long-term water resistance, is an ideal material for waterproof sealants. Polysulfide has att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/08C08G18/10C08G18/12C08G18/42C08G18/44C08G18/48C08G18/64C08G18/65C08G18/66C08G18/32C08J3/03
CPCC08G18/0814C08G18/10C08G18/12C08G18/4018C08G18/4081C08G18/4238C08G18/4277C08G18/44C08G18/4825C08G18/4829C08G18/4854C08G18/6453C08G18/6511C08G18/6517C08G18/6535C08G18/6607C08G18/6622C08G18/664C08G18/6644C08G18/6655C08G18/6674C08G18/6677C08G18/6688C08J3/03C08J2375/04C08G18/3206C08G18/3275C08G18/3281
Inventor 许戈文陶灿黄毅萍鲍俊杰熊潜生程芹王继印韩飞龙
Owner ANHUI UNIVERSITY
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