Poly(urethane-urea) associative thickener and preparation method and application thereof

A technology of associative thickener and urethane, applied in coatings, latex paints, etc., can solve the problems of coating stability, poor leveling, etc., achieve improved end-capping rate, stable storage performance, and shortened reaction time Effect

Inactive Publication Date: 2011-08-10
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the action of shear force, the molecular chains of the thickener will be arranged in the shear direction, and the viscosity will drop significantly. Therefore, this kind of thickener has many disadvantages: poor leveling when applied in coatings, serious splashing, and Disadvantages such as impact on coating stability

Method used

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  • Poly(urethane-urea) associative thickener and preparation method and application thereof
  • Poly(urethane-urea) associative thickener and preparation method and application thereof
  • Poly(urethane-urea) associative thickener and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 80 parts (mass ratio) of PEG6000 and 250 parts of toluene into a four-necked flask equipped with a stirrer, thermometer and distillation device, raise the temperature to 120°C to distill 100 parts of toluene, cool down to 50°C, add 4.68 parts of IPDI, Then add 0.3 parts of dibutyltin dilaurate (mass ratio). Under rapid stirring, the temperature was raised to 70° C. for 2 hours. Then, 10 parts of hexadecylamine and 0.1 part of triethylenediamine (mass ratio) were added to the prepolymer solution, and the temperature was raised to 80° C. for 6 hours to obtain a yellow transparent liquid. The product was poured into 3 times the volume of petroleum ether, and the resulting precipitate was filtered and vacuum-dried to obtain poly(urethane-urea).

[0051] Get 20 parts of dry poly(urethane-urea), 20 parts of ethylene glycol butyl ethers, 60 parts of deionized water mix and dissolve, be mixed with the solution that mass concentration is 20%, as thickening styrene-acrylic e...

Embodiment 2

[0057] Add 80 parts (mass ratio) of PEG6000 and 250 parts (mass ratio) of toluene into a four-neck flask equipped with a stirrer, a thermometer and a distillation device, raise the temperature to 120°C to distill 80 parts (mass ratio) of toluene, and cool down to 50 ℃, add 3.9 parts of IPDI, 0.5 parts of dibutyltin dilaurate (mass ratio). Under rapid stirring, the temperature was raised to 80°C for 6 hours, and then added. Then add 10 parts (mass ratio) of hexadecylamine and 0.4 parts of triethylenediamine (mass ratio) to the prepolymer solution, and react for 8 hours to obtain a yellow transparent liquid. The product was poured into 3 times the volume of petroleum ether, and the resulting precipitate was filtered and vacuum-dried.

[0058] Get 20 parts of dry thickening agent, 20 parts of ethylene glycol butyl ether, 60 parts of deionized water mix and dissolve, be configured into the solution that mass concentration is 20%, as thickening styrene-acrylic emulsion (styrene-ac...

Embodiment 3

[0063] Add 80 parts (mass ratio) of PEG10000 and 250 parts (mass ratio) of toluene into a four-necked flask equipped with a stirrer, a thermometer and a distillation device, raise the temperature to 135°C to distill 90 parts (mass ratio) of toluene, and cool down to 50 °C, add 3.56 parts of IPDI, add 0.1 part of dibutyltin dilaurate (mass ratio), and heat up to 60 °C for 2 hours under rapid stirring. Then, 10 parts (mass ratio) of hexadecylamine and 0.4 parts of triethylenediamine (mass ratio) were added to the prepolymer solution, and the temperature was raised to 80° C. for 2 hours. A yellow transparent liquid was obtained, and the product was poured into 3 times the volume of petroleum ether, and the resulting precipitate was filtered and vacuum-dried.

[0064] Get 20 parts of dry thickening agent, 20 parts of ethylene glycol butyl ether, 60 parts of deionized water mix and dissolve, be configured into the solution that mass concentration is 20%, as thickening styrene-acryl...

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Abstract

The invention discloses a poly(urethane-urea) associative thickener and a preparation method and application thereof. The thickener comprises poly(urethane-urea) polymer, deionized water and an organic solvent. The preparation method comprises the following steps of: in the presence of a catalyst, reacting polyether glycol subjected to methylbenzenea zeotropic water removal with diisocyanate for 2 to 6 hours to generate polyurethane prepolymer; adding primary amine and a catalyst, reacting for 2 to 8 hours, precipitating a product by using a precipitator, and drying the precipitate to obtain poly(urethane-urea) polymer; and preparing the prepared polymer, the deionized water and the organic solvent into solution to obtain the poly(urethane-urea) associative thickener. The prepared thickener has good thickening effect on styrene-acrylate emulsion and pure acrylic emulsion, so that the emulsion has the characteristics of high viscosity at a low shear rate and low viscosity at a high shear rate. The poly(urethane-urea) associative thickener also can be applied to other aqueous systems, such as the fields of coatings, cosmetics, papermaking, leather and the like.

Description

technical field [0001] The present invention relates to a kind of thickener, particularly relate to poly(urethane-urea) associative thickener and its preparation method and application, specifically, relate to the poly(urethane-urea) that is suitable for improving the viscosity of latex paint Urea) associative thickener and its preparation method and application. Background technique [0002] Water-based coatings have become one of the development directions of the coatings industry due to their advantages of reducing environmental pollution, improving the operating and construction environment, and reducing the discharge of a large amount of organic solvents. However, unlike solvent-based coatings, the viscosity of water-based coatings depends on the addition of thickeners. adjust. Thickener is a kind of rheology additive. After adding thickener, it can not only thicken the coating, but also endow the coating with excellent mechanical properties and physical and chemical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/02C08G18/48C09D7/12C08G18/66
Inventor 查刘生张立柱张高奇
Owner DONGHUA UNIV
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