Preparation method of linear and star polyethylene associated thickening agent

An associative thickener and polyurethane technology, applied in the direction of adhesive additives, polymer adhesive additives, coatings, etc., can solve problems such as complex process, difficult reaction control, high temperature sensitivity, etc., and achieve high sensitivity The effect of low cost, simple process and large tolerance

Inactive Publication Date: 2014-12-17
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The traditional process is complicated. It requires two-step reaction from polyethylene glycol to the product. The reaction control is very difficult. Trace impurities (water) will interfere with the reaction. The effective introduction of lipophilic end groups can only reach 1.8 (an average of 1.8 fats per molecule) Hydrocarbon lipophilic end group), some structures with only one lipophilic end group have no thickening effect
[0007] The traditional technology can only synthesize linear structure in theory, but it is found in practical application that linear structure has very high temperature sensitivity. The viscosity of water-based resin thickened with linear structure thickener will drift greatly with the change of temperature. Inconvenience caused by construction

Method used

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  • Preparation method of linear and star polyethylene associated thickening agent
  • Preparation method of linear and star polyethylene associated thickening agent
  • Preparation method of linear and star polyethylene associated thickening agent

Examples

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Effect test

example 1

[0032] Synthesis of Linear Polyurethane Associative Thickener

[0033] Add 61 parts of commercially available linear polyethylene glycol 6000 (number average molecular weight 6100) into a reaction flask equipped with stirring, a thermometer and a distillation device, dehydrate in vacuum at 105°C-120°C for 1-3 hours, cool to 80°C and add 6 Part of octadecyl isocyanate, react at 80°C-110°C for 3-5 hours, after the reaction, according to the required final product form, it can be directly out of the kettle, after the material is cooled, crushed and milled to obtain 100% polyurethane associative The thickener is dry powder, and water / ethylene glycol monobutyl ether mixed solvent can also be added to dilute the reactant to obtain various concentrations of polyurethane associative thickener solutions. It can also be diluted with pure water, and non-ionic surfactants such as isooctyl polyoxyethylene ether can be added to control the viscosity of the product to obtain a solvent-free p...

example 2

[0035] Synthesis of three-arm star polyurethane associative thickener

[0036] Add 1.34 parts of initiator trimethylolpropane and 1.7 parts of KOH into the reaction bottle, install a fractionation column, heat in an oil bath, and vacuum dehydrate at 75°C-85°C for 3-4h under stirring to prepare the initiator. Move the prepared initiator into a polymerization kettle that has been dried and heated to 110°C-130°C, vacuum fill N2 for replacement 3 times, and gradually introduce 120 parts of ethylene oxide (EO) for reaction. By controlling the amount of EO feed and The amount of cooling water is used to adjust the temperature of the system to react at 110°C-130°C and 0.4MPa-0.6MPa. After EO is fed, continue to react for 1 hour, ventilate, remove unreacted EO in vacuum, and then discharge at about 95°C. The product was diluted with water, ion-exchanged, and dried to obtain an intermediate product. The hydroxyl value was determined to be 16.0, the molecular weight was determined to be...

example 3

[0039] Synthesis of six-arm star polyurethane associative thickener

[0040] Add 1.82 parts of initiator D-sorbitol and 3.4 parts of KOH into the reaction bottle, install a fractionation column, heat in an oil bath, and vacuum dehydrate at 75°C-85°C for 3-4h under stirring to prepare the initiator. Move the prepared initiator into a polymerization kettle that has been dried and heated to 110°C-130°C, vacuum-fill N2 for 3 times, and gradually introduce 190 parts of ethylene oxide (EO) for reaction. By controlling the amount of EO feed and The amount of cooling water is used to adjust the temperature of the system to react at 110°C-130°C and 0.4MPa-0.6MPa. After EO is fed, continue to react for 1 hour, ventilate, remove unreacted EO in vacuum, and then discharge at about 95°C. The product was diluted with water, ion-exchanged, and dried to obtain an intermediate product. Its hydroxyl value was determined to be 17.1, its molecular weight was determined to be 19500 by GPC, and its...

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Abstract

The invention adopts the initiator of polyol and ring opening oxirane for polymerization to synthesize star polyethylene glycol with single-arm molecular weight of 2000-5000; the star polyethylene glycol reacts with alkyl isocyanate to modify an end group of polyethylene glycol into lipophilic alkyl. The lipophilic-hydrophilic polymer with star structure associates in a water system to increase the viscosity of the system. The star polyurethane associated thickening agent synthesized by the invention has very good stability.

Description

technical field [0001] The invention belongs to the field of new chemical materials, and in particular relates to the synthesis and process of a polyurethane associative thickener with a new structure. Background technique [0002] Polyurethane associative thickener is an important rheological additive for water-based coatings or adhesives. It is used to adjust the viscosity and rheological properties of water-based resins to facilitate construction. Polyurethane associative thickener is a polymer with lipophilic-hydrophilic-lipophilic structure. [0003] In the water system, the lipophilic end groups form association micelles to form a network structure to increase the viscosity of the system. [0004] At present, all polyurethane associative thickeners have a linear structure. The isocyanate-terminated prepolymer is obtained by reacting hydroxyl-terminated polyethylene glycol with excess diisocyanate, and then reacts with fatty alcohols to introduce lipophilic end groups....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/333C08G65/28C09D7/12C09J11/08
Inventor 王武生刘娜
Owner ANHUI UNIVERSITY
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