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A kind of environment-friendly water-oil universal polyurethane dispersant and preparation method thereof

A polyurethane dispersant, water and oil general technology, applied in the direction of coating, can solve problems such as poor compatibility, and achieve the effects of good compatibility, good color development and wide versatility

Active Publication Date: 2020-11-06
英德侗富贵科技材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is following problem in existing these two types of dispersants: (1) the dispersant of amphiphilic structure is as the amine salt of fatty acid, and its fatty acid part has lipophilic property, and amine salt part has hydrophilic property
Compared with dispersants with amphiphilic structure, polymer dispersants have larger molecules and better dispersion effects, but are not compatible with the system

Method used

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  • A kind of environment-friendly water-oil universal polyurethane dispersant and preparation method thereof
  • A kind of environment-friendly water-oil universal polyurethane dispersant and preparation method thereof
  • A kind of environment-friendly water-oil universal polyurethane dispersant and preparation method thereof

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preparation example Construction

[0021] The preparation method of an environmentally friendly water-oil universal polyurethane dispersant provided by the present invention includes the following steps:

[0022] (1) After mixing the isocyanate and the catalyst, the temperature is raised to 40~95°C, reacted for 4~12h, and then a terminator is added, the reaction is continued for 1~2h, vacuum is applied to remove the reactants that have not reacted completely, and the isocyanate polymer is obtained;

[0023] (2) After heating the polyether polyol to 80~95℃, add isocyanate and react for 2~4h, add water-based chain extender to carry out chain extension reaction, and then add the isocyanate polymer obtained in step (1) to react 2~4h, get water-oil universal polyurethane dispersant.

[0024] In a specific embodiment of the present invention, in the step (1) and step (2), the isocyanate is selected from toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate One or more of is...

Embodiment 1

[0040] The embodiment of the present invention provides a preparation method of an environmentally friendly water-oil universal polyurethane dispersant, which includes the following steps:

[0041] (1) Take 800g of hexamethylene diisocyanate (HDI) into the reactor, add 0.8g of catalyst (the catalyst is tetramethylammonium hydroxide and N,N',N"-tris(dimethylaminopropyl)- After mixing the hexahydrotriazine according to the mass ratio of 1:0.3), the reactor was heated to 60°C, kept for 7 hours, and the content of -NCO was detected to be 24.5%, and then 0.4g of parabenzoic acid polymerization inhibitor was added. , Turn on the vacuum, vacuum for 2h under the condition of 600mmHg, extract the above-mentioned unreacted reactants, and obtain isocyanate polymer (yield 75%, free HDI content 0.23%, -NCO content 20.8%) .

[0042] (2) Take 200g (molecular weight 1000, 0.2mol) polyether polyol and add it into the reaction kettle, the reaction kettle is heated to 85°C, 34.27g hexamethylene diis...

Embodiment 2

[0044] The embodiment of the present invention provides a preparation method of an environmentally friendly water-oil universal polyurethane dispersant, which includes the following steps:

[0045] (1) Take 800g of toluene diisocyanate (TDI) into the reactor, add 0.4g of catalyst (the catalyst is a mixture of tetramethylammonium hydroxide and tri-n-butylphosphine in a mass ratio of 1:0.5), and the reaction The kettle was heated to 40°C and reacted for 6 hours. The content of -NCO was determined to be 15.6%. 0.48g of benzoyl chloride polymerization inhibitor was added, the vacuum was turned on, and the vacuum was evacuated at 600mmHg for 1 hour. The above-mentioned unreacted reactants were extracted to obtain isocyanate Multimer (yield 60%, free TDI content 0.5%, -NCO content 11.5%).

[0046] (2) Take 200g (molecular weight 1000, 0.2mol) polyether polyol (polypropylene oxide polymer) into the reactor, heat up to 80 ℃, add 43.8g methyl diisocyanate (TDI, molecular weight 174, R = 0....

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Abstract

The invention discloses an environment-friendly water and oil universal polyurethane dispersant and a preparation method thereof. The preparation method comprises the following steps: carrying out catalytic reaction on isocyanate to obtain a polymer of isocyanate; after taking polyether glycol and isocyanate to react, carrying out chain extension; then taking a product and the obtained polymer ofisocyanate to react to obtain the water and oil universal polyurethane dispersant. The synthesized polyurethane dispersant has a relatively special structure and has an anchoring group; the anchoringgroup has a stable dispersed material, can be used for dispersing and covering a pigment and also can be used for grasping other resin groups to form a stable dispersion phase. The polyurethane dispersant also has the remarkable characteristics of good compatibility, good color developing performance, good flexibility and wide commonality and has excellent compatibility and dispersion effect in awater-oil system. Furthermore, in a preparation process of the polyurethane dispersant, an organic solvent is not added; in storage and utilization processes, the organic solvent is not added; the content of VOC (Volatile Organic Compounds) is zero, so that the environment-friendly water and oil universal polyurethane dispersant is an environment-friendly and efficient polyurethane dispersant.

Description

Technical field [0001] The invention relates to the technical field of polymer compound synthesis, in particular to an environmentally friendly water-oil universal polyurethane dispersant and a preparation method thereof. Background technique [0002] In coatings, inks, plastics, rubber, ceramics and other products, various inorganic and organic compounds are often used as pigments or fillers in the system. If these pigment fillers are not well dispersed in the system, they will cause many defects --- -Large color deviation, unevenness, non-fineness, unsightly, sedimentation, flocculation, poor stability, poor quality, poor selling, poor performance, etc.; the use of good dispersants can prevent pigments from settling and flocculating in the system, and improve pigments and fillers Stability in the system, color development, dispersibility, aesthetics, cost reduction, improved production efficiency and other benefits. According to the structural characteristics of dispersants, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08G18/66C08G18/32C08G18/10C09D7/65
CPCC08G18/10C08G18/6666C08G18/6685C08G18/792C08G18/794C09D7/65C08G18/3855
Inventor 谭树隆
Owner 英德侗富贵科技材料有限公司
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