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Trifunctional isocyanate modified polyurethane thickener and preparation method thereof

A technology of polyurethane thickener and isocyanate, applied in the direction of coating, can solve problems such as poor thickening effect, and achieve the effect of excellent thickening effect, good stability and strong thickening performance

Inactive Publication Date: 2021-01-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims at the problems existing in the above-mentioned prior art, uses trifunctional isocyanate to modify the thickener synthesized by polyurethane, avoids the use of diethanolamine or trishydroxymethylaminomethane, and greatly reduces the risk of violent polymerization, thus making The actual production becomes more feasible. At the same time, the thickener synthesized by modifying polyurethane with trifunctional isocyanate can control the number of hydrophobic segments and avoid excessive molecular weight and poor water solubility caused by too many hydrophobic segments. Poor dispersion And then lead to the problem of poor thickening effect

Method used

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  • Trifunctional isocyanate modified polyurethane thickener and preparation method thereof
  • Trifunctional isocyanate modified polyurethane thickener and preparation method thereof
  • Trifunctional isocyanate modified polyurethane thickener and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Raw material formula:

[0037] Table 1

[0038]

[0039] The preparation process comprises the following steps:

[0040] 1) Preparation of star-shaped polyurethane prepolymer: first add 144g PEG1500 to the reaction vessel, raise the temperature to 110°C, and vacuum dehydrate for 3 hours. When the water content of the system is less than 300ppm, cool the system to 60°C under the protection of nitrogen, and slowly go to the reaction 121g of HDI trimer toluene solution was added dropwise into the container, and after the dropwise addition was completed, 0.339g of dibutyltin dilaurate was added, and reacted at 100°C for 3 hours to obtain a star prepolymer.

[0041] 2) Preparation of trifunctional isocyanate-modified polyurethane thickener: reduce the temperature of the star prepolymer to 50°C, add 22.2g of IPDI, raise the temperature to 100°C for 2 hours to obtain an intermediate, and finally add 20g of tridecyl alcohol, React at 110°C for 2 hours, vacuumize at 110°C t...

Embodiment 2

[0060] Raw material formula:

[0061] table 5

[0062]

[0063] The preparation process comprises the following steps:

[0064] 1) Preparation of star-shaped polyurethane prepolymer: first add 192g PEG2000 to the reaction vessel, raise the temperature to 110°C, and vacuum dehydrate for 4 hours. When the water content of the system is less than 300ppm, cool the system to 60°C under the protection of nitrogen, and slowly go to the reaction 121g of HDI trimer toluene solution was added dropwise into the container, after the dropwise addition was completed, 3.1g of N,N-dimethylcyclohexylamine was added, and reacted at 90°C for 2h to obtain a star prepolymer.

[0065]2) Preparation of trifunctional isocyanate-modified polyurethane thickener: reduce the temperature of the star prepolymer to 50°C, add 24.8g of HMDI, raise the temperature to 100°C for 3 hours to obtain an intermediate, and finally add 28.345g of stearyl alcohol , reacted at 110°C for 2 hours, vacuumed at 110°C to...

Embodiment 3

[0074] Raw material formula:

[0075] Table 8

[0076]

[0077] The preparation process comprises the following steps:

[0078] 1) Preparation of star-shaped polyurethane prepolymer: first add 192g PEG2000 to the reaction vessel, raise the temperature to 100°C, and vacuum dehydrate for 3 hours. When the water content of the system is less than 300ppm, cool the system to 60°C under the protection of nitrogen, and slowly go to the reaction 111g of TDI trimer toluene solution was added dropwise into the container, after the dropwise addition was completed, 2g of organic bismuth was added, and reacted at 100°C for 2h to obtain a star prepolymer.

[0079] 2) Preparation of trifunctional isocyanate-modified polyurethane thickener: reduce the temperature of the star prepolymer to 50°C, add 22.2g of IPDI, raise the temperature to 100°C for 2 hours to obtain an intermediate, and finally add 28.345g of cetyl alcohol , reacted at 110°C for 2 hours, vacuumed at 110°C to remove toluen...

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Abstract

The invention discloses a trifunctional isocyanate modified polyurethane thickener and a preparation method thereof. The preparation method comprises the following steps: dehydrating polyethylene glycol; cooling the polyethylene glycol under the protection of nitrogen, slowly dropwise adding a toluene solution of trifunctional isocyanate, adding a catalyst, and performing reaction for 2-3 hours atthe temperature of 70-100 DEG C to obtain a star-shaped prepolymer; and then adding diisocyanate, performing heating reaction, adding long-chain fatty alcohol, performing reaction at the temperatureof 100-120 DEG C, removing methylbenzene, performing cooling, adding a cosolvent and water, and fully stirring to obtain the trifunctional isocyanate modified polyurethane thickener. The thickener forms a more stable hydrophobic associated network structure in an aqueous system, reduces the fluidity of a dispersion phase in the aqueous system, has good thickening performance and good stability, has the system viscosity of more than 2000 mPas under the addition amount of 0.3 wt%, and is transparent and uniform when dispersed in water.

Description

technical field [0001] The invention relates to a polyurethane thickener, in particular to a trifunctional isocyanate-modified water-based star-type associative polyurethane thickener and a preparation method and application thereof, which belong to the field of fine chemicals. Background technique [0002] The structure of the traditional associative polyurethane thickener is relatively simple. It is usually a linear associative polymer prepared by reacting excess isocyanate and polyethylene glycol to prepare a prepolymer, and then capping a long-chain alkanol. Ammonia thickener. This linear associative polyurethane thickener has a structure with hydrophobic groups at both ends. It forms a two-point association in the emulsion system to achieve the thickening effect, but its thickening effect Easily affected by temperature and deteriorated. Disclosed as CN109439056A is a kind of synthetic method of linear water-based polyurethane thickener, and its synthesized polyurethan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/28C08G18/48C08G18/73C08G18/75C08G18/76C09D7/43C09D133/04C08G18/10
CPCC08G18/10C08G18/2825C08G18/4833C08G18/724C08G18/725C08G18/73C08G18/755C08G18/758C08G18/7685C08G18/792C08G18/794C09D133/04C09D7/43C08L75/08
Inventor 瞿金清徐伟杰
Owner SOUTH CHINA UNIV OF TECH
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