Water-dispersible polyisocyanate curing agent as well as preparation method and application thereof

A polyisocyanate and diisocyanate technology, applied in the field of polyurethane, can solve the problems of effective functional group content, water resistance and strength performance, and no further description of the industrial practicability and influence of water-based TDI curing agents.

Pending Publication Date: 2022-06-17
J&H XIANGYANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 105949436 A discloses a water-dispersible HDI-TDI hybrid trimer curing agent, which uses nonionic hydrophilic modifiers and anionic hydrophilic modifiers to modify the HDI-TDI trimer. The addition of a hydrophilic agent can introduce part of TDI (less than 25wt% isocyanate content) in the curing agent system, but neutralizing anions still use amine compounds, and the existence of tertiary amines still has an impact on the TDI system; and it uses epoxy The addition of polyether polyols of ethylene or propylene oxide has an impact on the effective functional group content, water resistance and strength properties of the curing agent.
Chinese patent CN 111423343 A is a kind of hydrophilic diisocyanate and its preparation method and application. The application example 3 of its specification discloses a preparation method of a TDI curing agent without amine, but the patent does not further illustrate the water-based TDI The industrial applicability of the curing agent, that is, how long is the activation time after it is mixed with the water-based resin, and whether it can meet the requirements of the construction process, etc., because the -NCO activity of the water-based TDI curing agent is very high, and the reaction speed with water is higher than that with hydroxyl reaction speed

Method used

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  • Water-dispersible polyisocyanate curing agent as well as preparation method and application thereof
  • Water-dispersible polyisocyanate curing agent as well as preparation method and application thereof
  • Water-dispersible polyisocyanate curing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The present embodiment has prepared a water-dispersible polyisocyanate curing agent, and the steps are:

[0087] A1. Preparation of sulfonate modified diisocyanate (TDI) prepolymer:

[0088] In the No. 1 reaction flask, add 400g (4.598 equivalents) of TDI, turn on the stirrer, heat up to 30°C, take 352g (1.532 equivalents) of small-molecule sulfonate diol, add it in six times, and react 0.5 times after each addition. h, until all the additions are completed, after 1h of reaction, the temperature is first heated to 50°C for 2h, then heated to 60°C for 5h, and then samples are taken every 0.5h to measure the -NCO content. , to obtain sulfonate-modified diisocyanate (TDI) prepolymer.

[0089] The viscosity of the sulfonate-modified diisocyanate (TDI) prepolymer was tested to be 4200 mPa.s / 25°C, and the NCO% was 17.1%.

[0090] A2. Preparation of sulfonate modified multifunctional internal emulsifier:

[0091] In the No. 2 reaction flask, add 200 g (0.814 equivalent) of ...

Embodiment 2

[0097] The present embodiment has prepared a water-dispersible polyisocyanate curing agent, and the steps are:

[0098] a) Preparation of sulfonate modified multifunctional internal emulsifier:

[0099] In the No. 1 reaction flask, add 200g (0.814 equivalent) of the sulfonate-modified diisocyanate (TDI) prepolymer prepared in step A1 of Example 1 and 70g of propylene glycol monomethyl ether acetate (hydrophilic solvent), turn on the stirrer , heat up to 50°C, add 9.1g (0.2035 equivalents) of trimethylolpropane (small molecule polyol), react without heating for 1h, heat up to 60°C for 2h, then heat up to 80~85°C for 4h and measure the reactant When the -NCO content of -NCO decreased and became stable, the reaction was stopped; the residual TDI monomer was removed, the temperature of the material was reduced to 60 °C, 70 g of propylene glycol methyl ether acetate was added, and the material was discharged to obtain a sulfonate modified polyfunctional Internal emulsifier.

[01...

Embodiment 3

[0105] The present embodiment has prepared a water-dispersible polyisocyanate curing agent, and the steps are:

[0106] In the reaction flask, add 250g of polyisocyanate prepolymer 2, turn on the stirrer, then add 50g of the multifunctional internal emulsifier obtained in step A2 of Example 1, heat up to 85°C, mix and react for 2h, cool down to 60°C, add 15g of cyclohexane, 15g of 200# gasoline and 6g of Siloke 4600 defoamer, stir evenly, and discharge to obtain a water-dispersible polyisocyanate curing agent.

[0107] After testing, the solid content of the curing agent is 67%, the viscosity is 1100 mPa·s / 25°C, the NCO% is 11.0%, and the residual TDI is 0.28%.

[0108] Pour 100 g of the water-dispersible polyisocyanate curing agent obtained in this example into 100 g of distilled water under stirring, and stir at a rotational speed of 400 rpm for 20 min to obtain a milky white blue light emulsion.

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Abstract

The invention discloses a water-dispersible polyisocyanate curing agent as well as a preparation method and application thereof. According to the water-dispersible polyisocyanate curing agent, a sulfonate modified diisocyanate prepolymer, micromolecular polyol, a polyisocyanate prepolymer, a delayed curing aid and a defoaming agent are used as raw materials, and the sulfonic group modified polyisocyanate curing agent with polyfunctional-NCO groups at the end is prepared. The water-dispersible polyisocyanate curing agent disclosed by the invention is used as a cross-linking component in production of polyurethane products, and can be matched with hydroxyl-containing water-based resin to prepare two-component water-based polyurethane quick-drying paint, and the prepared quick-drying paint has the advantages of longer activation period, high drying speed, high hardness, easiness in polishing, no adhesion to abrasive paper and the like; the aqueous dispersion is mainly applied to priming paint, anti-corrosion paint, automobile refinishing paint, wooden furniture paint and the like of various coating systems, and can also be used for other rapidly-crosslinked aqueous dispersions.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, and in particular relates to a water-dispersible polyisocyanate curing agent and a preparation method and application thereof. Background technique [0002] In order to improve the environmental protection of chemical products, the emission of VOCs (volatile organic compounds, volatile organic compounds) is strictly limited, and the polyurethane industry is transforming to water-based. However, there are still some problems in the transformation of two-component polyurethane coatings to water-based coatings: for example, there are relatively few types of water-based polyurethane curing agents. The traditional waterborne polyurethane curing agent is mainly based on HDI (hexamethylene diisocyanate), IPDI (isophorone diisocyanate), HMDI (dicyclohexylmethane diisocyanate) as the curing agent prepared from isocyanate raw materials, and the above-mentioned curing agents exist. Due to the problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/32C08G18/76C08G18/79C09D175/04C09D5/00C09J175/04C09D11/102
CPCC08G18/10C08G18/3855C08G18/7621C08G18/3206C08G18/794C09D175/04C09D5/002C09J175/04C09D11/102C08G2150/00C08G2170/00
Inventor 周国豪周建明何绍群罗铭荣陆佩仪
Owner J&H XIANGYANG CHEM
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