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Preparation method and application of polyurethane associative thickener

A technology of associative thickener and polyurethane, applied in the direction of coating, etc., can solve problems such as difficult dispersion, affecting workability, turbidity of thickener system, etc., and achieve good thickening effect

Active Publication Date: 2016-06-01
HUIZHOU FEIKAI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The thickener system synthesized in the above-mentioned patent is turbid and has high viscosity, which is not easy to disperse in the water-based system
The viscosity of the coating system using general thickener will change with the outside temperature. The coating prepared in winter may need to add thickener due to the low viscosity in summer, and the coating prepared in summer may be due to the low viscosity in winter. Excessive viscosity affects workability

Method used

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  • Preparation method and application of polyurethane associative thickener
  • Preparation method and application of polyurethane associative thickener
  • Preparation method and application of polyurethane associative thickener

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preparation example Construction

[0030] The embodiment of the present invention provides a kind of preparation method of polyurethane associative thickener, described method comprises:

[0031] Step 1: At 50~150°C, the dehydrated diol and diisocyanate are completely reacted under the action of a catalyst to obtain an intermediate;

[0032] In the examples provided by the present invention, the glycol dehydration is specifically carried out by the following method: put the glycol material into a reactor with a condenser tube and a thermometer, and dehydrate it at 80-120°C for 2-4 hours under vacuum. Hours until the moisture content of the material is less than 0.5%. Moisture content was determined using the Karl Fischer moisture method.

[0033] In order to ensure full contact and complete reaction between the diol and the diisocyanate, the reactor provided in the embodiment of the present invention is equipped with a stirring device. After the diol is dehydrated, a catalyst is added to the reactor, and the r...

Embodiment 1

[0049] Weigh raw materials: Weigh 120g PEG6000, 6.66g IPDI, 0.063g dibutyltin maleate and 9.61g capping agent 1, wherein capping agent 1 is 3,4-diethyl-1-octanol polyoxyethylene ten Ether, its structural formula is as follows:

[0050]

[0051] Preparation of polyurethane associative thickener: put 120g of PEG6000 into a reactor equipped with a condenser, thermometer and stirring device, and dehydrate at 80°C for 4 hours under vacuum until the water content of the material is less than 0.1%. Add the catalyst dibutyltin maleate into the reactor, stir the dehydrated PEG6000 with a stirring device, and add IPDI dropwise to the dehydrated PEG6000 while stirring, after adding 6.66g of IPDI dropwise, react at 80°C for 12 hour, the mass percent content of NCO groups in the reaction system was detected to be 0.6%, and the midpoint reaction was ended. Add 9.61g of end-capping agent 1 into the reactor, stir and mix, and react at 80°C for 6 hours. After testing, the mass percentage o...

Embodiment 2

[0054] Weigh raw materials: Weigh 80g PEG8000, 3.490g TDI, 0.083g dibutyltin dilaurate and 9.61g capping agent 1.

[0055] Preparation of polyurethane associative thickener: put 80g of PEG8000 into a reactor equipped with a condenser, thermometer and stirring device, and dehydrate at 100°C for 2 hours under vacuum until the water content of the material is less than 0.5%. Add the catalyst dibutyltin dilaurate into the reactor, stir the dehydrated PEG8000 with a stirring device, and add TDI dropwise to the dehydrated PEG8000 while stirring, after adding 3.490g of TDI dropwise, react at 80°C for 12 hours, The mass percent content of NCO groups in the reaction system was detected to be 0.7%, and the midpoint reaction was terminated. Add 9.61g of end-capping agent 1 into the reactor, stir and mix, and react at 80°C for 6 hours. After testing, the mass percentage of NCO groups in the reaction system is 0.03%. After the reaction is completed, pour it out of the reactor while it is h...

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Abstract

The invention discloses a preparation method and application of a polyurethane associative thickener, and belongs to the field of thickeners. The method comprises: at 50-150 DEG C, completely reacting a dehydrated dihydric alcohol and a diisocyanate under the effect of a catalyst, so as to obtain an intermediate; mixing the intermediate with an end-capping reagent according to a molar ratio of 1:2, reacting at 30-100 DEG C to obtain the polyurethane associative thickener. The end-capping reagent has the structural formula shown in the specification, and the in structural formula, R is an epoxy group, an alkyl or a phenyl ring, x is an integer of 0-10, y is an integer of 0-10, and z is an integer of 0-30. The structural characteristic of the end-capping reagent enables the thickening effect of the thickener to be stable, the viscosity variation of paint employing the thickener is not large when the environment temperature changes, so that the problem is avoided that the normal usage of the paint is influenced by relatively large viscosity variation of the paint caused by environment temperature variation.

Description

technical field [0001] The invention relates to the field of thickeners, in particular to an efficient and stable waterborne polyurethane associative thickener and a preparation method thereof. Background technique [0002] A thickener is an additive that can increase the melt viscosity or liquid viscosity. Thickeners commonly used in the coatings field are polyurethane associative thickeners. In the coating system, the polyurethane associative thickener forms micelles like a macromolecular surfactant, connects the hydrophilic end and the lipophilic end, and forms a three-dimensional network structure in the system, which increases the viscosity of the system and improves the coating quality. The rheological properties of the system. [0003] In the patent CN1840587A, a polyurethane associative thickener is synthesized by using dodecyl alcohol as an end-capping agent. [0004] In the process of realizing the present invention, the inventor finds that there are at least th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/83C08G18/48C09D7/12
CPCC08G18/4825C08G18/831C08L2205/025C09D7/40C09D7/63C09D7/65C09D125/14C08L75/08C08K13/02C08K2003/265C08K2003/2241C08K2003/324C08K5/06
Inventor 张志鹏曹松
Owner HUIZHOU FEIKAI NEW MATERIAL CO LTD
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