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Branched hydrophobic end-modified associative water-based urethane thickener as well as preparation method and application thereof

An end-modified and associative technology, used in polyurea/polyurethane coatings, coatings, etc., and can solve problems such as poor water solubility, excessive molecular weight, and poor dispersion.

Inactive Publication Date: 2021-04-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The primary purpose of the present invention is to address the shortcomings of the prior art, to provide a method that effectively prevents the risk of sudden polymerization in the prior art, and can effectively avoid dispersion due to excessive molecular weight and poor water solubility caused by too many hydrophobic segments. Bad problem, short reaction time, good thickening effect, simple preparation process, low price and high chemical stability branched hydrophobic terminal modified associative water-based urethane thickener and its preparation method

Method used

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  • Branched hydrophobic end-modified associative water-based urethane thickener as well as preparation method and application thereof
  • Branched hydrophobic end-modified associative water-based urethane thickener as well as preparation method and application thereof
  • Branched hydrophobic end-modified associative water-based urethane thickener as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw material formula:

[0036] Table 1

[0037]

[0038] The preparation method of branched hydrophobic terminal modified associative water-based urethane thickener comprises the following steps:

[0039] 1) Preparation of branched end-capping agent: first add 2.2 g of glycerol to the reaction vessel, heat up to 100°C-140°C, vacuum dehydrate for 3 hours, dehydrate until the water content is lower than 300ppm, and then cool the system under the protection of nitrogen to Slowly add 20.08g of octadecyl isocyanate dropwise to the reaction vessel at 60°C. After the dropwise addition, add 0.2g of dibutyltin dilaurate dropwise and react at 70°C for 3 hours to obtain a branched modified sealant containing a single hydroxyl group. terminal agent;

[0040] 2) Preparation of branched hydrophobic end-modified associative water-based urethane thickener: add 30g PEG6000 to the reaction vessel, heat up to 100°C, dehydrate in vacuum for 3 hours, dehydrate until the water content i...

Embodiment 2

[0055] Raw material formula:

[0056] Table 4

[0057]

[0058]

[0059] The preparation method of branched hydrophobic terminal modified associative water-based urethane thickener comprises the following steps:

[0060] 1) Preparation of branched end-capping agent: first add 2.72g of pentaerythritol to the reaction vessel, heat up to 140°C, vacuum dehydrate for 5h, dehydrate until the water content is lower than 300ppm, then cool the system to 70°C under the protection of nitrogen, slowly add to 11.91g of butyl isocyanate was added dropwise into the reaction vessel, and after the addition was completed, 0.1g of organic bismuth was added dropwise, and reacted at 100°C for 2 hours to obtain a branched modified end-capping agent containing a single hydroxyl group;

[0061] 2) Preparation of branched hydrophobic end-modified associative water-based urethane thickener: add 10g PEG1000 to the reaction vessel, heat up to 140°C, vacuum dehydrate for 5h, dehydrate until the wat...

Embodiment 3

[0067] Raw material formula:

[0068] Table 6

[0069]

[0070]

[0071] The preparation method of branched hydrophobic terminal modified associative water-based urethane thickener comprises the following steps:

[0072] 1) Preparation of branched end-capping agent: first add 5.08g of dipentaerythritol into the reaction vessel, raise the temperature to 120°C, vacuum dehydrate for 4h, dehydrate until the water content is lower than 300ppm, then cool the system to 65°C under the protection of nitrogen, slowly Add 16.10 g of hexadecyl isocyanate dropwise to the reaction vessel. After the dropwise addition, add 1 g of stannous octoate dropwise and react at 80° C. for 5 hours to obtain a branched modified end-capping agent containing a single hydroxyl group;

[0073]2) Preparation of branched hydrophobic end-modified associative water-based urethane thickener: Add 80g PEG8000 into the reaction vessel, heat up to 130°C, vacuum dehydrate for 4 hours, dehydrate until the water ...

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Abstract

The invention discloses a branched hydrophobic end-modified associative water-based urethane thickener as well as a preparation method and application thereof. The preparation method comprises the following steps of: dehydrating and cooling polyol, dropwise adding monoisocyanate, dropwise adding a catalyst, reacting at 70-100 DEG C for 2-5 hours to obtain a monohydroxy-containing long alkyl chain branched end-capping reagent, dehydrating polyethylene glycol, cooling the system to 60-70 DEG C under the protection of nitrogen, dropwise adding the branched end-capping reagent and diisocyanate, reacting for 2-4 hours at the temperature of 100-120 DEG C, and adding a cosolvent and water to obtain the branched hydrophobic end-modified associative water-based urethane thickener. The thickener has 2-4 hydrophobic alkyl chain terminations, realizes a good thickening effect under the condition of a low addition amount, and has the advantages of high thickening efficiency, simple process and cheap and easily available raw materials.

Description

technical field [0001] The invention relates to a polyurethane thickener, in particular to a branched hydrophobic terminal-modified associative water-based urethane thickener and a preparation method and application thereof, which belong 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 polymer prepared by reacting excess isocyanate and polyethylene glycol to prepare a prepolymer, and then capping a long-chain alkanol. Ammonia 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 temperature and deteriorated. For example, Chinese invention patent application CN109439056A discloses a non-ionic associative water-based polyurethane thickener and a prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/28C08G18/71C08G18/32C09D133/04C09D7/43C09D175/04
CPCC08G18/285C08G18/3206C08G18/4833C08G18/71C08L2205/02C09D133/04C09D175/04C09D7/43C08L75/08C08L75/04
Inventor 瞿金清徐伟杰
Owner SOUTH CHINA UNIV OF TECH
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