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Hyperbranched curing agent for two-component polyurethane waterproof coating and preparation method thereof

A two-component polyurethane and waterproof coating technology, used in polyurea/polyurethane coatings, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of carcinogenic price and high cost, and achieve low production cost and low dosage. , the effect of a simple synthesis process

Active Publication Date: 2010-05-19
江苏超力建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of the hyperbranched type curing agent that is used for two-component polyurethane waterproof coating, and the hyperbranched type curing agent that has a large amount of terminal hydroxyls prepared by said method, to overcome traditional curing Agent MOCA has the risk of carcinogenesis and the disadvantage of being expensive

Method used

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  • Hyperbranched curing agent for two-component polyurethane waterproof coating and preparation method thereof
  • Hyperbranched curing agent for two-component polyurethane waterproof coating and preparation method thereof
  • Hyperbranched curing agent for two-component polyurethane waterproof coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 10.01g of succinic anhydride and 13.32g of diisopropanolamine (refluxing and dehydrating before use), first dissolve diisopropanolamine in 40mL of carbon tetrachloride, and pour it into a three-port container equipped with a thermometer and a water separator after dissolving. In the flask, dissolve succinic anhydride with 40ml of carbon tetrachloride, then slowly drop it into the three-necked flask, use a magnetic stirrer to react at 10°C for 2h, and distill off the solvent under reduced pressure to obtain AB 2 type monomer.

[0033] Then add 50mL toluene to the above-mentioned three-necked flask, then add 1.49g trimethylolpropane as the nuclear molecule, wait until the trimethylolpropane is completely dissolved, then add 0.15g sulfamic acid, stir and heat until reflux occurs, Separate the generated water with a water separator, finish the reaction after 6 hours of heat preservation, cool down and discharge the material, and obtain the target product after dissolu...

Embodiment 2

[0035] Take by weighing 15.01g succinic anhydride, 19.98g diisopropanolamine (reflux dehydration before use), first diisopropanolamine is dissolved in 50mL pyridine, after dissolving, pour into a three-necked flask equipped with a thermometer and a water separator, Dissolve succinic anhydride with 50ml of pyridine, then slowly drop it into a three-necked flask, use a magnetic stirrer to react at 25°C for 3h, and distill off the solvent under reduced pressure to obtain AB 2 type monomer.

[0036] Then add 60mL toluene to the above-mentioned three-necked flask, then add 0.96g trimethylolpropane as the nuclear molecule, wait until the trimethylolpropane is completely dissolved, then add 0.20g sulfamic acid, stir and heat until reflux occurs, Separate the generated water with a water separator, finish the reaction after 7 hours of heat preservation, cool down and discharge the material, and obtain the target product after dissolution, precipitation and drying. This product is the ...

Embodiment 3

[0038] Take by weighing 20.01g succinic anhydride, 26.64g diisopropanolamine (refluxing dehydration before use), at first diisopropanolamine is dissolved in 60mL chloroform, after dissolving, pour in the there-necked flask that thermometer and water separator are housed, Dissolve succinic anhydride in 60ml of chloroform, then slowly drop it into a three-necked flask, use a magnetic stirrer to react at 30°C for 4h, and distill off the solvent under reduced pressure to obtain AB 2 type monomer.

[0039] Then add 60mL xylene to the above-mentioned three-necked flask first, then add 0.60g trimethylolpropane as the nuclear molecule, wait until the trimethylolpropane is completely dissolved, then add 0.25g sulfamic acid, stir and heat until reflux occurs , use a water separator to separate the generated water, finish the reaction after 9 hours of heat preservation, cool down and discharge the material, and obtain the target product after dissolution, precipitation and drying. This p...

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Abstract

The invention relates to a hyperbranched curing agent for two-component polyurethane waterproof coating and a preparation method thereof. The preparation method comprises the following steps: (1) reacting equimolar anhydride with equimolar diisopropanolamine in the equal molar weight in an aprotic solvent at a temperature of between 0 and 40 DEG C for 1 to 6 hours, and removing the solvent through vacuum distillation to prepare an AB2-type monomer having a carboxyl redical and two hydroxyl redicals; and (2) dissolving the prepared AB2-type monomer into an aromatic solvent, adding nuclear molecules and a catalyst into the solvent for heating reflux, dehydrating reaction water, performing heat preservation to react for 4 to 10 hours, and stopping the reaction to prepare a target product through dissolution, sedimentation and drying. The structure of the hyperbranched curing agent is shown in the figure 1. The hyperbranched curing agent has the advantages of simple preparation process, lower production cost, and suitability for large-scale industrial production. The prepared hyperbranched curing agent has a large number of active end functional groups, has low viscosity, high solubility and less adulterating amount, has excellent intermiscibility with polyurethane prepolymer, can improve the crosslinking density of a polyurethane system greatly and integrally improve the tensile strength and tenacity of the polyurethane waterproof coating and the bond strength of the polyurethane waterproof coating with substrates.

Description

technical field [0001] The invention relates to a curing agent for two-component polyurethane waterproof coatings, in particular to a hyperbranched curing agent with a large number of terminal hydroxyl groups, and a preparation method for the above curing agent, belonging to polyurethane waterproof coating additives in chemical building materials technology field. Background technique [0002] Polyurethane waterproof coating has been widely used in various waterproof projects due to its excellent waterproof performance. It has high tensile strength, good elasticity, excellent corrosion resistance, long service life, and strong adaptability to the deformation of cracks in the base layer. performance, and convenient construction and maintenance. At present, two-component polyurethane coatings are the mainstream in my country's polyurethane waterproof coatings, which have the most varieties and the largest consumption in polyurethane waterproof coatings. Two-component polyure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/12C07C233/18C09D7/12C09D175/04C09D5/00
Inventor 寿崇琦林栋初永杰徐小韦徐磊杨文刘冰蒋大庆
Owner 江苏超力建材科技有限公司
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