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Preparation method of linear water-based polyurethane thickener containing hydrophobic side bases

A technology of water-based polyurethane and thickener, applied in the field of polyurethane, can solve the problems such as complicated synthesis steps of hydrophobic diol chain extender, and achieve the effect of obvious thickening effect, simple preparation steps and increasing viscosity

Inactive Publication Date: 2014-06-25
LISHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"A comb-like polyurethane associative thickener and its preparation method and application" (CN 101633718A) patent technology, based on the preparation method of the online water-based polyurethane thickener, the long-chain hydrophobic base, its thickening effect has been improved, but the synthesis steps of its hydrophobic diol chain extender are relatively cumbersome

Method used

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  • Preparation method of linear water-based polyurethane thickener containing hydrophobic side bases

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Embodiment 1

[0022] A preparation method of a linear water-based polyurethane thickener containing hydrophobic side groups, the preparation steps are:

[0023] Mix 40wt% ~ 50wt% polymer diol and 22wt% ~ 30wt% diisocyanate, in N 2 Stir for 1h to 3h at 50°C to 70°C in air, then add 10wt% to 18wt% end-capping agent, stir at 50°C to 70°C for 1h to 3h to obtain a polyurethane prepolymer, and then add it to the prepared Add 12wt%-20wt% chain extender to the obtained polyurethane prepolymer, and stir at 50°C-70°C for 1h-3h to prepare a linear water-based polyurethane thickener containing hydrophobic side groups.

[0024] In this embodiment: the molecular weight of polyethylene glycol is 1000-4000, the diisocyanate is isophorone diisocyanate, the blocking agent is n-octanol, and the chain extender is 1,2-decanediol.

Embodiment 2

[0026] A preparation method of a linear water-based polyurethane thickener containing hydrophobic side groups, the preparation steps are:

[0027] Mix 48wt%~55wt% of polymer diol, 15wt%~25wt% of diisocyanate and 0.5wt%~2wt% of catalyst, in N 2 Stir at 70-90°C for 2.5h-4.5h, then add 15wt%-25wt% end-capping agent, and stir at 70-90°C for 2.5h-4.5h to obtain a polyurethane prepolymer, then Add 8wt%-16wt% chain extender to the prepared polyurethane prepolymer, and stir at 70-90°C for 2.5-4.5h to prepare a linear water-based polyurethane thickener containing hydrophobic side groups.

[0028] In this embodiment: the molecular weight of polyethylene glycol is 4000-6000, the diisocyanate is toluene diisocyanate, the catalyst is triethylenediamine, the end-capping agent is dodecyl alcohol, and the chain extender is 1,2-dodecane diisocyanate alcohol.

Embodiment 3

[0030] A preparation method of a linear water-based polyurethane thickener containing hydrophobic side groups, the preparation steps are:

[0031] Mix 52wt% ~ 60wt% polymer diol, 10wt% ~ 18wt% diisocyanate and 2wt% ~ 4wt% catalyst, in N 2 Stir for 4h-6h at 80°C-100°C in air, then add 22wt%-30wt% end-capping agent, stir for 4h-6h at 80°C-100°C to prepare polyurethane prepolymer, and then add to the prepared Add 5wt%-10wt% chain extender to the obtained polyurethane prepolymer, and stir at 80°C-100°C for 4h-6h to prepare a linear water-based polyurethane thickener containing hydrophobic side groups.

[0032] In this embodiment: the molecular weight of polyethylene glycol is 6000-8000, the diisocyanate is diphenylmethane diisocyanate, the catalyst is dibutyltin dilaurate, the end-capping agent is myristyl alcohol, and the chain extender is 1,2- Tetradecanediol.

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Abstract

The invention relates to a linear water-based polyurethane thickener containing hydrophobic side bases and a preparation method of the linear water-based polyurethane thickener. The preparation method is characterized in that 40 weight percent to 60 weight percent of dibasic alcohol polymers, 10 weight percent to 30 weight percent of diisocyanate and 0 weight percent to 5 weight percent of catalysts are mixed, under the condition of N2 gas existence and the temperature being 50 DEG C to 100 DEG C, the stirring is carried out for 1 to 6 hours, then, 10 weight percent to 30 weight percent of end-capping agents are added, under the condition of the temperature being 50 DEG C to 100 DEG C, the stirring is carried out for 1 to 6 hours, polyurethane prepolymers are prepared, then, 5 weight percent to 20 weight percent of chain extenders are added into the prepared polyurethane prepolymers, the stirring is carried out for 1 to 6 hours under the condition of the temperature being 50 DEG C to 100 DEG C, and the linear water-based polyurethane thickener containing hydrophobic side bases is prepared. The linear water-based polyurethane thickener and the preparation method have the characteristics that no solvent exists, the toxicity is low, the environment is protected, the preparation process is simple, and the like. The prepared linear water-based polyurethane thickener containing hydrophobic side bases is applicable to the thickening of water-based paint, and the obvious thickening effect is realized.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, and in particular relates to a preparation method of a linear water-based polyurethane thickener containing hydrophobic side groups. Background technique [0002] With the improvement of people's quality of life and the enhancement of environmental awareness, water-based coatings are favored due to their advantages such as less environmental pollution and convenient construction. However, water-based coatings with water as the dispersion medium have low viscosity, which will lead to unsatisfactory painting effects. , so it is necessary to add additives to adjust its viscosity. [0003] Water-based polyurethane has the characteristics of strong thickening ability, low viscosity, strong stability, and is not easy to grow mold. It is suitable for thickening water-dispersed systems. Most of the developed water-based polyurethane thickeners have a linear structure, the polyether chain in the mol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C09D175/08
Inventor 杨明华陈新周瑜陈红祥杨升林银利
Owner LISHUI UNIV
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