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Silicon modified associative waterborne polyurethane thickener and its preparation method and application

A water-based polyurethane, associative technology, applied in the direction of coating, etc., can solve the problems of poor resistance to solvent interference, etc., achieve good thickening effect, lower requirements for synthesis conditions, and strong thickening performance

Active Publication Date: 2022-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of poor solvent resistance in the thickening effect of traditional linear polyurethane thickeners, the present invention introduces silicon-containing groups into the polyurethane molecular chain to improve the solvent resistance of polyurethane thickeners

Method used

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  • Silicon modified associative waterborne polyurethane thickener and its preparation method and application
  • Silicon modified associative waterborne polyurethane thickener and its preparation method and application
  • Silicon modified associative waterborne polyurethane thickener and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Raw material formula:

[0030] Table 1

[0031]

[0032] A preparation method of a silicon-modified associative water-based polyurethane thickener, comprising the steps of:

[0033] First add 60g of PEG6000 to the reaction vessel, raise the temperature to 100°C, and vacuum dehydrate for 3 hours until the water content is lower than 300ppm; then cool the polyethylene glycol to 60°C under nitrogen protection, and add 6g of aminoalkyl-terminated PDMS dropwise at one time (300), add 4.84g cetyl alcohol and 6.75g HDI successively after the dropwise addition, react at 70°C for 2h, then add 0.18g dibutyltin dilaurate, heat up to 100°C for 1h, cool down to 50°C, add 38g diglycol Alcohol monobutyl ether, 30g dipropylene glycol monobutyl ether and 29g deionized water were fully stirred for 30 minutes to obtain a white silicon-modified water-based associative polyurethane thickener with a solid content of 40%.

[0034] Thickener performance: The rotational viscosity at 25°C i...

Embodiment 2

[0051] Raw material formula:

[0052] table 5

[0053]

[0054]

[0055] The preparation process comprises the following steps:

[0056] First add 20g PEG2000 to the reaction vessel, raise the temperature to 140°C, and vacuum dehydrate for 5 hours until the water content is lower than 300ppm; then cool the polyethylene glycol to 70°C under nitrogen protection, and add 20g of hydroxyalkyl-terminated PDMS dropwise at one time (1000), add 5.42g stearyl alcohol and 8.92g IPDI successively after the dropwise addition, react at 100°C for 5h, then add 0.2g N,N-dimethylcyclohexylamine, heat up to 120°C for 1-2h, cool down to At 60°C, add 20g of N-ethylpyrrolidone, 27g of dipropylene glycol monobutyl ether and 20g of deionized water, and stir thoroughly for 60 minutes to obtain a white silicon-modified water-based associative polyurethane thickener with a solid content of 40%.

[0057] Thickener properties: The rotational viscosity at 25°C is 6760mpas.

[0058] Thickener appli...

Embodiment 3

[0065] Raw material formula:

[0066] Table 8

[0067]

[0068] The preparation process comprises the following steps:

[0069] First add 80g of PEG8000 to the reaction vessel, raise the temperature to 120°C, and vacuum dehydrate for 4 hours until the water content is less than 300ppm; then cool the polyethylene glycol to 65°C under nitrogen protection, and add 12g of hydroxyalkyl-terminated PDMS dropwise at one time (600), add 4g tridecyl alcohol and 10.52g HMDI successively after the dropwise addition, react at 80°C for 2-5h, then add 1.6g organic bismuth, heat up to 110°C and react for 1-2h, cool down to 55°C, add 54g diglycol Alcohol monobutyl ether, 40g N-ethylpyrrolidone and 40g deionized water were fully stirred for 45min to obtain a white silicon-modified water-based associative polyurethane thickener with a solid content of 40%.

[0070] Thickener performance: The rotational viscosity at 25°C is 5760mpas.

[0071] Thickener application: Measurement scheme Referr...

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Abstract

The invention discloses a silicon-modified associative water-based polyurethane thickener and its preparation method and application. The preparation method is as follows: under the protection of nitrogen, the temperature of the polyethylene glycol after drying is controlled to be 60-70°C, and a reactive group is added. Group-capped polydimethylsiloxane, then add long-chain fatty alcohol and diisocyanate, react at 70°C-100°C for 2-5h, then add catalyst, raise the temperature to 100°C-120°C for 1-2h, cool down to 50- At 60°C, add co-solvent and water, and stir thoroughly to obtain a silicon-modified associative water-based polyurethane thickener. The bright point of the product obtained by the present invention is that the thickening efficiency is high, and in the ethanol system, the product can exhibit excellent anti-interference performance.

Description

technical field [0001] The polyurethane thickener involved in the invention, in particular, relates to a silicon-modified associative water-based polyurethane thickener and its preparation method and application, belonging 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 polyurethane prepared by reacting an excess of isocyanate with polyethylene glycol to prepare a prepolymer, and then capping with a long-chain alkanol. 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 solvents and deteriorated. For example, Chinese invention patent application CN109439056A discloses a synthetic method of a linear water-based polyurethane thickener. The synthes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/61C08G18/48C08G18/28C09D133/04C09D7/43
CPCC08G18/61C08G18/4833C08G18/2825C09D133/04C09D7/43C08L75/04
Inventor 瞿金清徐伟杰
Owner SOUTH CHINA UNIV OF TECH
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