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Method for preparing star-like waterborne polyurethane associated type thickening agent

An associative thickener and water-based polyurethane technology, applied in the field of polyurethane materials, can solve the problems of difficult practical application, cumbersome synthesis of hydrophobic diol and star polyethylene glycol, etc., and achieve low construction viscosity, low cost, good The effect of the thickening effect

Inactive Publication Date: 2017-02-08
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of its hydrophobic diol and star polyethylene glycol is cumbersome and difficult for practical application.

Method used

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  • Method for preparing star-like waterborne polyurethane associated type thickening agent
  • Method for preparing star-like waterborne polyurethane associated type thickening agent
  • Method for preparing star-like waterborne polyurethane associated type thickening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of star-shaped waterborne polyurethane associative thickener in the present embodiment is as follows:

[0036] 1. Dehydration treatment

[0037] Add 40 g of polyethylene glycol with a molecular weight of 6000 g / mol into the reactor, raise the temperature to 110° C. for vacuum dehydration for 3 h;

[0038] 2. Prepolymerization

[0039] The polyethylene glycol after dehydration is cooled to 55 ℃, under the protection of nitrogen, the acetone solution of isophorone diisocyanate (IPDI) is added dropwise with stirring, the quality of isophorone diisocyanate is 2.96g, after dripping, in Insulate at 55°C for 10 minutes, then raise the temperature to 85°C for 3 hours to obtain a prepolymer.

[0040] 3. Half-capping reaction

[0041] After the prepolymerization reaction is completed, keep the temperature of the system at 85° C., add 1.61 g of cetyl alcohol and 0.06 g of dibutyltin dilaurate to the system for half-capping reaction, and react at 85° C. fo...

Embodiment 2

[0048] The preparation method of star-shaped waterborne polyurethane associative thickener in the present embodiment is as follows:

[0049] 1. Dehydration treatment

[0050] Add 40 g of polyethylene glycol with a molecular weight of 4000 g / mol into the reactor, and heat up to 110° C. for vacuum dehydration for 3 h;

[0051] 2. Prepolymerization

[0052] The polyethylene glycol after dehydration is cooled to 55 ℃, under the protection of nitrogen, the acetone solution of isophorone diisocyanate (IPDI) is added dropwise with stirring, the quality of isophorone diisocyanate is 4.44g, after dripping, in Insulate at 55°C for 10 minutes, then raise the temperature to 85°C for 3 hours to obtain a prepolymer.

[0053] 3. Half-capping reaction

[0054] After the prepolymerization reaction was completed, the temperature of the system was kept at 85° C., and 2.42 g of cetyl alcohol and 0.06 g of dibutyltin dilaurate were added to the system for half-capping reaction, and the reaction...

Embodiment 3

[0061] The preparation method of star-shaped waterborne polyurethane associative thickener in the present embodiment is as follows:

[0062] 1. Dehydration treatment

[0063] Add 40 g of polyethylene glycol with a molecular weight of 8000 g / mol into the reactor, raise the temperature to 110°C for vacuum dehydration for 3 h;

[0064] 2. Prepolymerization

[0065] The polyethylene glycol after dehydration is cooled to 55 ℃, under the protection of nitrogen, the acetone solution of isophorone diisocyanate (IPDI) is added dropwise with stirring, the quality of isophorone diisocyanate is 2.22g, after dropping, in Insulate at 55°C for 10 minutes, then raise the temperature to 85°C for 3 hours to obtain a prepolymer.

[0066] 3. Half-capping reaction

[0067] After the prepolymerization reaction was completed, the temperature of the system was kept at 85° C., 1.21 g of cetyl alcohol and 0.06 g of dibutyltin dilaurate were added to the system for half-capping reaction, and the reac...

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Abstract

The invention discloses a method for preparing a star-like waterborne polyurethane associated-type thickening agent. The method comprises the following steps of: in the presence of an inert gas, adding dehydrated polyethylene glycol to react with isocyanate so as to prepare a prepolymer, performing semi-blocking by using long-chain alkanol, performing chain extension by using a chain extension agent of a polyhydric alcohol structure, and drying after the opeation is completed, thereby obtaining the star-like waterborne polyurethane associated type thickening agent. The star-like waterborne polyurethane associated type thickening agent synthesized by using the method has multiple hydrophobic long chains, is relatively large in molecular weight, can form a relatively complete and stable hydrophobic associated network structure in a water phase or emulsion system, and is relatively good in thickening property and stability. The star-like waterborne polyurethane associated-type thickening agent synthesized by using the method is very good in thickening effect, is capable of effectively increasing the viscosity of an emulsion with a relatively small use amount, and moreover has the characteristics of being high in viscosity under the action of small shearing force and low in construction viscosity under the action of large shearing force.

Description

[0001] 1. Technical field [0002] The invention relates to a method for preparing a thickener, in particular to a method for preparing a star-shaped water-based polyurethane associative thickener, which belongs to the field of polyurethane materials. [0003] 2. Background technology [0004] Waterborne polyurethane associative thickener is a kind of thickener developed in the 1980s. It is a polymer composed of lipophilic-hydrophilic-lipophilic triblock structure. Due to its unique molecular structure, it The thickening mechanism and rheological properties are different from traditional thickeners. Compared with traditional thickeners, it has stronger thickening ability, better leveling and storage stability, and high film fullness, which has attracted widespread attention. . [0005] Most of the traditional polyurethane associative thickeners have a linear structure. Usually, a prepolymer is prepared by reacting excess isocyanate with polyethylene glycol, and then a linear p...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/32C08G18/30C08G18/10
CPCC08G18/755C08G18/10C08G18/4833C08G18/2825C08G18/3206
Inventor 杨建军宋忠奥吴庆云吴明元张建安
Owner ANHUI UNIVERSITY
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