Silicon-modified associative waterborne polyurethane thickener as well as preparation method and application thereof

A water-based polyurethane, associative technology, applied in the direction of coating, can solve problems such as poor resistance to solvent interference, and achieve the effect of good thickening effect, reduced fluidity, and good application prospects

Active Publication Date: 2021-04-30
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 as well as preparation method and application thereof
  • Silicon-modified associative waterborne polyurethane thickener as well as preparation method and application thereof
  • Silicon-modified associative waterborne polyurethane thickener as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Raw material formula:

[0030]Table 1

[0031]

[0032]A method for preparing a silicon modified association aqueous polyurethane thickener, including the following steps:

[0033]In the reaction vessel, 60 g of PEG6000 was added to 100 ° C, and the vacuum dehydration 3H to a water content was less than 300 ppm; then polyethylene glycol cooled to 60 ° C under nitrogen protection, 6 g of a 6 g of an aminoalkyl-closed PDMS (300), 4.84 g of hexadecanol and 6.75 g of HDI were added after the dropwise addition was completed, and the reaction was added at 70 ° C, then 0.18 g of dibutyltin, heated to 100 ° C reaction for 1 h, cooled to 50 ° C, add 38 g of two Gan Alcohol monobutyl ether, 30 g of dipropylene glycol monobutyl ether and 29 g of deionized water, thoroughly stirred for 30 min to give 40% a white silicon modified aqueous associative polyurethane thickener.

[0034]Thickener properties: 25 ° C in a rotation viscosity of 4250 mPas.

[0035]Thickener Application: Mass sheet: Packed in accordan...

Embodiment 2

[0051]Raw material formula:

[0052]table 5

[0053]

[0054]

[0055]The preparation process includes the following steps:

[0056]20 g of PEG2000 was added to the reaction vessel, warmed to 140 ° C, vacuum dehydration 5 h to a water content below 300 ppm; then cooled to 70 ° C under nitrogen protection, and the 20 g of hydroxyalkyl-lowering PDMs was added dropwise. (1000), 5.42 g of octade alcohol and 8.92 g of ipdi were added sequentially after the dropwise addition, 0.2 g n, N-dimethylcyclohexylamine was added to 120 ° C for 1-2 h, cooling to At 60 ° C, 20 g of N-ethylpyrrolidone, 27 g of dipropylene glycol monobutyl ether, and 20 g of deionized water were added, thoroughly stirred for 60 min to give 40% a white silicon modified aqueous associative polyurethane thickener.

[0057]Thickener properties: 25 ° C lower rotation viscosity of 6760 mPas.

[0058]Thickener Application: Measurement Scheme Reference Example 1, the rotational viscosity of the coated system at 25 ° C is measured in Table 6 when ...

Embodiment 3

[0065]Raw material formula:

[0066]Table 8

[0067]

[0068]The preparation process includes the following steps:

[0069]80 g of PEG8000 was added to the reaction vessel, warmed to 120 ° C, vacuum dehydration 4H to a water content below 300 ppm; then cooled to 65 ° C under nitrogen protection, and 12 g of hydroxyalkyl block PDMS was added to 65 ° C under nitrogen protection. (600) After the dropwise addition, 4 g of tenth alcohol was added to 10.52 g of HMDI, and the reaction was reacted at 80 ° C for 2-5 h, then the 1.6 g of organic bismuth was added, and the temperature was increased to 110 ° C for 1-2 h, cooled to 55 ° C, add 54 g of two. Alcohol monobutyl ether, 40 gN-ethylpyrrolidone and 40 g of deionized water, thoroughly stirred for 45min to give 40% a white silicon modified aqueous associative polyurethane thickener.

[0070]Thickener properties: 25 ° C in a rotation viscosity of 5760 mPas.

[0071]Thickener Application: Measurement Scheme Reference Example 1, the rotational viscosity of th...

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Abstract

The invention discloses a silicon-modified associative waterborne polyurethane thickener as well as preparation method and application thereof. The preparation method comprises the following steps: controlling the temperature of dried polyethylene glycol to be 60-70 DEG C under the protection of nitrogen, adding reactive group-terminated polydimethylsiloxane, adding long-chain fatty alcohol and diisocyanate, reacting for 2-5 hours at the temperature of 70 DEG C and 100 DEG C, adding a catalyst, heating to 100-120 DEG C, reacting for 1-2 hours, cooling to 50-60 DEG C, adding a cosolvent and water, and fully stirring to obtain the silicon-modified associative waterborne polyurethane thickener. The obtained product has the advantages that the thickening efficiency is high, and the product can show excellent anti-interference performance in an ethanol system.

Description

Technical field[0001]The polyurethane thickener according to the present invention, particularly to a silicon-modified association aqueous polyurethane thickener and a preparation method thereof, belonging to the field of fine chemical.Background technique[0002]The conventional association-type polyurethane thickener is more simple, usually by an excess of isocyanate and polyethylene glycol, then the preparation of the prepolymented polyethylene, and then the long chain alkanol performs linear association polyureurine Thickener. This linear associative polyuretine thickener is a structure with a hydrophobic group in both ends that form two points in the emulsion system to achieve thickening effect, but its thickening effect. It is easy to be influenced by the solvent. A method of synthesizing a linear aqueous polyurethane thickener is disclosed in Chinese inventive patent application CN109439056A, which is the synthesized polyurethane thickener belonging to a conventional alkyl chai...

Claims

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Application Information

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Patent Type & Authority Applications(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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