Preparation method for closed-type aliphatic-series isocyanate water dispersoid

An isocyanate and aliphatic technology, applied in the field of preparation of closed aliphatic isocyanate water dispersion, can solve problems such as low bonding or bonding strength, and achieve the effect of simplifying the use process and stabilizing the system

Inactive Publication Date: 2012-04-18
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problem that the existing blocked aliphatic isocyanate has low

Method used

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  • Preparation method for closed-type aliphatic-series isocyanate water dispersoid
  • Preparation method for closed-type aliphatic-series isocyanate water dispersoid
  • Preparation method for closed-type aliphatic-series isocyanate water dispersoid

Examples

Experimental program
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Example Embodiment

[0024] Specific embodiment 1: The method for preparing the blocked aliphatic isocyanate aqueous dispersion in this embodiment is carried out according to the following steps:

[0025] Step 1. Dry the polyol at 60-100°C;

[0026] Step two, add 0.5~1.5mol polyol and 0.2~0.8mol DMPA (dimethylolpropionic acid) into 10-250mL compound solvent, the compound solvent consists of solvent A and solvent B at a ratio of 1:(3~10) The volume ratio is mixed at room temperature. Solvent A is acetone and solvent B is ethyl acetate or dichloromethane. Stir for 10-60 minutes, and then bubbling nitrogen for 15-45 minutes at a flow rate of 3-15mL / min (the purpose is to remove the solution In oxygen), then heat to 50~95℃ and keep for 15~45 minutes;

[0027] Step 3. Then add 0.5-2mol aliphatic isocyanate dropwise, the dropping rate is controlled at 2-5s / drop, and then react at 50-95℃ for 0.5-7 hours;

[0028] Step 4. Then add a blocking agent at 25-70°C, the amount of blocking agent is 1 to 3 times the cont...

Example Embodiment

[0031] Specific embodiment two: This embodiment is different from specific embodiment one in that the polyol in step one is polyester polyol or polyether polyol. The other steps and parameters are the same as in the first embodiment.

Example Embodiment

[0032] Specific embodiment three: this embodiment is different from specific embodiment one in that: the polyol in step one is polyoxypropylene glycol, polyoxyethylene glycol, polyethylene glycol, polyethylene adipate two Alcohol, polycaprolactone or poly 2,3-dimethyl-2,3-butanediol. The other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a preparation method for closed-type aliphatic-series isocyanate water dispersoid, which aims to solve the technical problems of low cementing or splicing strength existing in the traditional closed-type aliphatic-series isocyanate. The preparation method for the closed-type aliphatic-series isocyanate water dispersoid comprises the following steps: 1. drying polyatomic alcohol; 2. adding the polyatomic alcohol and dimethylolpropionic acid into compound solvent, stirring, introducing nitrogen, and keeping warm for 15-45 minutes after heating; 3. dripping aliphatic-series isocyanate; 4. adding blocking agent; 5. adding triethylamine, then adding deionized water, emulsifying, and stopping introducing the nitrogen; and 6. removing the compound solvent. The closed-typehexamethylene diisocyanate (HDI) water dispersoid prepared with the preparation method can be used for high-grade cementing and finishing fields, such as wood lacquers, leather finishing agent, aqueous adhesive and the like, also can serve as the crosslinking curing agent and the accessory ingredient for film forming resin and is applied to the fields, such as enamelled wires, paper treating agent and the like.

Description

technical field [0001] The invention relates to a preparation method of a blocked aliphatic isocyanate aqueous dispersion. Background technique [0002] Isocyanate compounds and their polymers have a wide application space due to their strong adhesion, good gloss, good corrosion resistance and wear resistance, and can be made into various materials or additives with excellent performance. Especially used as adhesives and coatings, it has become an important bonding and coating agent because of its excellent bonding performance, no formaldehyde release, excellent low temperature resistance and aging resistance, and strong adaptability to the materials to be bonded. . [0003] However, the isocyanate group is chemically active, easily reacts with water and substances containing active hydrogen, and is very sensitive to moisture. As a result, the prepared isocyanate adhesive is easy to react with water vapor and makes storage difficult, especially in aqueous solutions. The st...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08L75/04C08G18/66C08G18/80C08G18/42C08G18/48C08G18/34C09D175/04C09J175/04
Inventor 李志国张永良顾继友张彦华
Owner NORTHEAST FORESTRY UNIVERSITY
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