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Preparation method of polyurethane thickening agent

A technology of polyurethane and associative thickener, applied in the direction of coating, etc., which can solve the problems of insufficient dry hiding power, increased construction strength, and low viscosity

Inactive Publication Date: 2008-01-02
SHENZHEN OCEANPOWER NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under medium and high shear rates during construction, these windings are forced to be pulled apart, and the molecular chains are straightened along the shear direction, causing the viscosity of the system to drop rapidly. If the viscosity is too low, the coating film is thin and the texture is not plump. Insufficient dry hiding power, and thus increased construction strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Put 91.26 grams of polyethylene glycol 6000 materials into a four-necked flask with a condenser, a thermometer, and a separatory funnel dropper, heat up until all the materials in the flask are dissolved, start stirring, and heat up to 100±2°C for Vacuum dehydration for 2.5 to 3.0 hours (the phenomenon of boiling material running away in vacuum dehydration should not occur), until the water content of the material is lower than 0.3% (use a trace moisture tester for trace moisture detection);

[0020] 2) Nitrogen is slowly passed into the four-necked flask, and 0.05 gram of catalyst dibutyltin dilaurate is added in the four-necked flask simultaneously, and the stirring speed is accelerated to 500r / m, and the materials in the flask are mixed at this stirring speed for 15 ~20min, at the same time, the temperature should be properly lowered to 80±2℃;

[0021] 3) 5.31 grams of hydrogenation-4,4 diphenylmethane diisocyanate (HMDI) is dissolved in 53.1 grams of methyl isobu...

Embodiment 2

[0027] 1) Put 95.04 grams of polyethylene glycol 8000 materials into a four-necked flask with a condenser, a thermometer, and a separatory funnel dropper, heat up until all the materials in the flask are dissolved, start stirring, and heat up to 100±2°C for vacuum Dehydration for 2.5 to 3.0 hours (the phenomenon of boiling material running away in vacuum dehydration should not occur), until the water content of the material is lower than 0.3% (use a trace moisture tester for trace moisture detection);

[0028] 2) Nitrogen is slowly passed into the four-necked flask, and 0.05 gram of catalyst dibutyltin dilaurate is added in the four-necked flask simultaneously, and the stirring speed is accelerated to 500r / m, and the materials in the flask are mixed at this stirring speed for 15 ~20min, at the same time, the temperature should be properly lowered to 80±2℃;

[0029] 3) Dissolve 3.55 grams of isophorone diisocyanate (IPDI) in 35.5 grams of N-methylpyrrolidone inert solvent, plac...

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PUM

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Abstract

The invention discloses a method for preparing a hydrophobic modified polyurethane associated thickener, which comprises the following steps: proceeding with vacuum-relieving dehydration of the screened polyethylene glycol in the fore-hole boiling flask; removing oxide by venting nitrogen after the acceptable dehydration; mixing by adding the accelerant; dropping indifferent solvent of diisocyanate in the proper temperature; generating polyurethane prepolymer by the polymerization reaction of high polymer free radical solution; proceeding with chain expansion polymerization by adding chain expansion agent; proceeding the hydrophobic modifying with the sealant; proceeding with the pressure reduction desolvation of the indifferent solvent and getting thickener when the polymerization reaction completes and the content of the free isocyanate is less than index range. The hydrophobic modified polyurethane associated thickener in benzenepropyl emulsion paint is provided with the considerable application function.

Description

【Technical field】 [0001] The invention relates to the preparation of a polyurethane thickener, in particular to the preparation of a hydrophobically modified polyurethane associative thickener. 【Background technique】 [0002] Water-based paints include water-soluble paints and latex paints, among which latex paints are the most widely used. Hydrophobic modified polyurethane associative thickeners are mainly for latex paints. Water-based paints have become one of the development directions of the paint industry because of their advantages of reducing environmental pollution, improving the operating and construction environment, and saving a large amount of organic solvents. Water-based coatings use water as a dispersion, and the viscosity of water is small, and the pigments are easy to precipitate during storage. The coating film is not plump, easy to sag, low splash resistance, poor wear resistance and other defects during construction. Therefore, the viscosity of water-bas...

Claims

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Application Information

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IPC IPC(8): C09D7/12C08G18/42C08G18/24
Inventor 刘震何唯平
Owner SHENZHEN OCEANPOWER NEW MATERIALS TECH
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