Cyclic diol modified water-based polyisocyanate curing agent and its preparation method and application

A polyisocyanate, cyclic diol technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of reducing the NCO group functionality of the curing agent, the crosslinking density and water dispersibility of the coating film, and the medium resistance of the coating film. and mechanical properties, solvent resistance and mechanical strength of the coating film, etc., to achieve good transparency and gloss, improve and medium resistance, and good medium resistance.

Active Publication Date: 2018-06-22
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 4,472,550 uses polyethylene glycol monoethers whose end groups are heterocyclic or benzene rings to modify MDI oligomers with different functionalities. They are used in wood adhesives, which can prolong their pot life, and have poor water dispersibility, Reduced medium resistance and mechanical properties of the coating film
Chinese patent CN1560030 reacts the refined decarboxylated cashew nut shell liquid with diisocyanate and polyethylene glycol in a molar ratio of 1:1:1 to prepare a monohydroxyl compound with a 15-carbon hydrophobic long chain at the end, and then modify the polyisocyanate to prepare water-based Curing agent, this method prolongs the service life of two-component coatings, and improves the curing rate of the coating film. There is a high content of flexible alkyl chains in the curing agent, low functionality, high viscosity and difficult dispersion, and the solvent resistance and mechanical properties of the coating film. Reduced strength
The above modifications all reduce the NCO group functionality of the curing agent, the crosslinking density of the coating film and the water dispersibility, resulting in slow curing rate, low hardness, poor mechanical strength and medium resistance of the 2K-WPU coating film, and the synthesis process is complex and the product Poor stability and other defects

Method used

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  • Cyclic diol modified water-based polyisocyanate curing agent and its preparation method and application
  • Cyclic diol modified water-based polyisocyanate curing agent and its preparation method and application
  • Cyclic diol modified water-based polyisocyanate curing agent and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of cyclic diol modified water-based polyisocyanate curing agent

[0028] The type and mass percentage of each component raw material:

[0029]

[0030] Preparation process: Under the protection of nitrogen, add HDI trimer and antioxidant HP-136 to the reaction kettle in sequence, heat up to 60°C, and mix cyclohexane dimethanol and polyethylene glycol monomethyl ether (molecular weight 750) Add it dropwise into the system within 50 minutes, react for 6 hours, and when the NCO content of the system reaches the theoretical value, add the terminator methyl p-toluenesulfonate to terminate the reaction, and obtain a cyclic diol-modified water-based polyisocyanate curing agent .

[0031] (2) Performance of cyclic diol-modified water-based polyisocyanate curing agent: a colorless transparent viscous liquid with a viscosity (25°C) of 3100mPa·s, an NCO content of 18.5%, and a solid content of 100%;

[0032] (3) Preparation of 2K-WPU coating:

[0033] The pre...

Embodiment 2

[0040] (1) Preparation of cyclic diol modified water-based polyisocyanate curing agent

[0041] The type and mass percentage of each component raw material:

[0042]

[0043] Preparation process: Under the protection of nitrogen, add HDI trimer, IPDI trimer mixture, antioxidant Irgafos 168 to the reaction kettle in sequence, raise the temperature to 55°C, add 1,4-cyclohexanedimethanol, polyethylene glycol Add the mixed solution of monomethyl ether (molecular weight 1000) into the system dropwise within 50 minutes, react for 8 hours, and when the NCO content in the system reaches the theoretical value, add the terminator p-benzoyl chloride to terminate the reaction, and the cyclic diol can be obtained Modified water-based polyisocyanate curing agent;

[0044] (2) Performance of cyclic diol-modified water-based polyisocyanate curing agent: a colorless transparent viscous liquid with a viscosity (25°C) of 5000mPa·s, an NCO content of 14.9%, and a solid content of 100%;

[00...

Embodiment 3

[0051] (1) Preparation of cyclic diol modified water-based polyisocyanate curing agent

[0052] The type and mass percentage of each component raw material:

[0053]

[0054]

[0055] Preparation process: under the protection of nitrogen, add HDI-TDI mixed trimer, antioxidants (Irganox 245 and Irgafos 264), hydroquinone bishydroxyethyl ether (HQEE) to the reactor in sequence, and heat up to 65 ° C. Add polyethylene glycol monomethyl ether (molecular weight: 400) into the system dropwise within 25 minutes, react for 6 hours, and when the NCO content in the system reaches the theoretical value, add the terminator phosphoric acid to terminate the reaction, and the cyclic diol can be obtained Modified water-based polyisocyanate curing agent;

[0056] (2) Performance of cyclic diol-modified water-based polyisocyanate curing agent: a colorless transparent viscous liquid with a viscosity (25°C) of 8500mPa·s, an NCO content of 13.8%, and a solid content of 100%;

[0057] (3) P...

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Abstract

The invention discloses a cyclic diol modified water-borne polyisocyanate curing agent as well as a preparation method and an application thereof. The preparation method comprises steps as follows: 75%-90% by mass of polyisocyanate, 0.01%-0.5% by mass of an antioxidant, 1%-10% by mass of cyclic diol and 5%-21% by mass of hydrophilic polyether are sequentially added to a reaction kettle under the protection of nitrogen, the temperature is increased to 40-80 DEG C, the reaction is performed for 6-8 h, when the content of NCO in the system reaches a theoretical value, 0.01%-0.5% by mass of a terminating agent is added to terminate the reaction, and a product is obtained. The water-borne polyisocyanate curing agent prepared with the method has the advantages that the synthesis process is simple, product storage is stable, and a prepared double-component water-borne polyurethane coating is high in film drying speed, high in hardness and good in medium resistance and has longer construction working life.

Description

technical field [0001] The invention relates to an isocyanate curing agent, in particular to a cyclic diol-modified water-based polyisocyanate curing agent and a preparation method thereof. The water-based curing agent can be used to prepare two-component water-based polyurethane coatings. Background technique [0002] With the increasingly stringent environmental regulations, high-performance, non-polluting, cross-linked water-based coatings have been developed rapidly, among which two-component water-based polyurethane coatings (2K-WPU) have high cross-linking degree, high hardness, water resistance and weather resistance. , with better leveling and construction environment adaptability has become a research hotspot. The two-component water-based polyurethane coating is composed of water-based hydroxyl resin and water-based polyisocyanate curing agent, which are packaged separately, and the two are mixed evenly for construction when used. During the mixing process, the -N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/28C08G18/62C09D175/04
CPCC08G18/283C08G18/3212C08G18/6216C09D175/04
Inventor 瞿金清郭丽朱延安
Owner SOUTH CHINA UNIV OF TECH
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