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Alcohol end capping nonionic polyurethane cross-linking agent and preparation method and application thereof

A polyurethane crosslinking agent, non-ionic technology, used in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesive types, etc., can solve the problem of high dissociation temperature of closed products, free formaldehyde environmental pollution, High price and other problems, to achieve the effect of good freeze-thaw stability, good freeze-thaw stability, and improved mechanical properties

Inactive Publication Date: 2010-11-17
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various blocking agents commonly used now have their own advantages and disadvantages in the blocking effect of isocyanate groups (NCO). For example, phenolic compounds are easy to block NCO, but the dissociation temperature of the blocked products is relatively high, and it is necessary to consider the impact of free phenol on the environment during use. The problem of pollution; oximes are also easy to seal NCO, but they are expensive. In addition, when aldoximes are used as sealing agents, there will be problems such as free aldehydes polluting the environment.
Both phenolic and oxime blocking agents cannot obtain water-based blocked isocyanate blocked monomers, while solvent-based blocked isocyanate monomers have a greater impact on the environment due to the use of a large amount of solvents, which is no longer in line with the development direction of "green" in contemporary society

Method used

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  • Alcohol end capping nonionic polyurethane cross-linking agent and preparation method and application thereof
  • Alcohol end capping nonionic polyurethane cross-linking agent and preparation method and application thereof
  • Alcohol end capping nonionic polyurethane cross-linking agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Mix 0.1mol TDI (2,4-toluene diisocyanate), 0.05mol PEG1000 (polyethylene glycol 1000), 0.02mol TMP (trimethylolpropane), 25ml acetone and 2 drops (20 drops are 1ml, ie 0.2wt %) stannous octoate was added in a 250ml four-necked round-bottomed flask equipped with a stirrer, an air duct, and a condenser, and reacted at 40°C for 6h; the temperature was raised to 60°C, and 0.045mol ethylene glycol monoethyl ether was added, and reacted for 5 hours Until the NCO group is completely blocked, it is detected by infrared detection at 2250-2270cm -1 There is no characteristic absorption peak of the NCO group; the temperature is lowered to 25 degrees, and water is added under stirring at 1500rpm for dispersion to obtain an aqueous dispersion of alcohol-terminated nonionic polyurethane crosslinking agent, which is a light yellow transparent viscous liquid. The solid content is 30%, the pH is 6.7, and the viscosity is 185Cps. The infrared spectrogram of the prepared alcohol-terminate...

Embodiment 2

[0042] Mix 0.1mol TDI (2,4-toluene diisocyanate), 0.02mol PEG1000 (polyethylene glycol 1000), 0.005mol TMP (trimethylolpropane), 20ml methyl ethyl ketone and 2 drops (20 drops are 1ml, that is, 0.2 wt%) stannous acid was added with a stirrer, in the 250ml four-necked round bottom flask of air duct and condenser, and reacted for 3h at 80°C; the temperature was raised to 90°C, and 0.16mol ethylene glycol monoethyl ether was added to react 2 Hours until the NCO group is completely blocked, by infrared detection, at 2250 ~ 2270cm -1 There is no characteristic absorption peak of the NCO group; the temperature is lowered to 20 degrees, and water is added under stirring at 1500rpm for dispersion to obtain an aqueous dispersion of alcohol-terminated nonionic polyurethane crosslinking agent, which is a light yellow transparent viscous liquid. Solid content is 30%, pH7.3, viscosity 160Cps. The infrared spectrum of the prepared alcohol-terminated nonionic polyurethane crosslinking agent...

Embodiment 3

[0044] Mix 0.1mol IPDI (isophorone diisocyanate), 0.04mol PPG1000 (polypropylene glycol 1000), 0.01mol glycerin, 15ml N-methylpyrrolidone and 2 drops (20 drops are 1ml, ie 0.2wt%) dilaurate dilaurate Add butyltin into a 250ml four-necked round-bottomed flask equipped with a stirrer, an air duct, and a condenser, and react at 60°C for 5h; raise the temperature to 80°C, add 0.1mol ethylene glycol monobutyl ether, and react for 3 hours until the NCO group The group is completely blocked, and after infrared detection, it is at 2250-2270cm -1 There is no characteristic absorption peak of the NCO group; the temperature is lowered to 30 degrees, and water is added under stirring at 1500 rpm to disperse to obtain an aqueous dispersion of alcohol-terminated nonionic polyurethane crosslinking agent, which is a light yellow transparent viscous liquid. The solid content is 30%, the pH is 6.1, and the viscosity is 140Cps. The infrared spectrum of the prepared alcohol-terminated nonionic p...

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Abstract

The invention discloses an alcohol end capping nonionic polyurethane cross-linking agent and a preparation method and application thereof. The preparation method particularly comprises the following steps of: performing an addition reaction of 100 parts of diisocyanate, 20 to 50 parts of nonionic hydrophilic monomer and 5 to 20 parts of polyhydric alcohol in a reactor based on the mole ratio; and then capping free isocyanate radicals by adding 45 to 160 parts of alcohol end-capping agent to obtain the alcohol end capping nonionic polyurethane cross-linking agent. The cross-linking agent prepared by the invention can be mixed with water in any ratio and has the advantages of high storage stability at a higher temperature, a lower temperature and room temperature, convenient use and high performance; the cross-linking agent can be used for aqueous emulsion of polymer prepared by polymerizing polyurethane or free radicals, and particularly for water-based paints and water-based adhesives; besides, the cross-linking agent can be also used for improving mechanical properties of polyhydroxy polymer-containing materials.

Description

technical field [0001] The invention belongs to the field of polyurethane crosslinking agents, and in particular relates to a nonionic polyurethane crosslinking agent terminated by alcohols, and also relates to a preparation method and application of the crosslinking agent. Background technique [0002] As an important raw material for the synthesis of polyurethane and related products - isocyanate monomer, because its own NCO group has high reactivity with nucleophilic reagents, the system is very active at room temperature and cannot exist in the form of a single component; In addition, the NCO group in isocyanate reacts violently with water, but when it is used as raw materials such as coatings or other products, such as adhesives, the synthetic polyurethane coatings and adhesives are resistant to moisture in solvents, resins, pigments and other raw materials and The moisture contained in the humid air on the construction site will be very sensitive, which brings a lot of...

Claims

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Application Information

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IPC IPC(8): C08G18/80C09D175/04C09J175/04C08G18/42
Inventor 吕满庚申腾飞梁利岩
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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