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Environment-friendly water and oil universal polyurethane dispersant and preparation method thereof

A polyurethane dispersant, universal technology for water and oil, applied in the direction of coating, etc., can solve the problems of poor compatibility, and achieve the effect of good compatibility, wide versatility, and good flexibility

Active Publication Date: 2018-08-07
英德侗富贵科技材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Environment-friendly water and oil universal polyurethane dispersant and preparation method thereof
  • Environment-friendly water and oil universal polyurethane dispersant and preparation method thereof
  • Environment-friendly water and oil universal polyurethane dispersant and preparation method thereof

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preparation example Construction

[0021] The preparation method of a kind of environment-friendly water-oil universal polyurethane dispersant provided by the invention comprises the following steps:

[0022] (1) Mix the isocyanate and the catalyst, heat up to 40-95°C, react for 4-12 hours, then add a terminator, continue the reaction for 1-2 hours, vacuumize to remove the unreacted reactants, and obtain a polymer of isocyanate;

[0023] (2) After heating the polyether polyol to 80-95°C, add isocyanate, react for 2-4 hours, add water-based chain extender for chain extension reaction, then add the multimer of isocyanate obtained in step (1), and react After 2-4 hours, a general-purpose polyurethane dispersant for water and oil is obtained.

[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 isocyanate and 4,4'-bis-(isocyanato...

Embodiment 1

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

[0041] (1) Take 800g of hexamethylene diisocyanate (HDI) in the reaction kettle, add 0.8g of catalyst (the catalyst is tetramethylammonium hydroxide and N,N',N"-tris(dimethylaminopropyl)- After hexahydrotriazine is mixed according to the mass ratio of 1:0.3), the temperature of the reactor is raised to 60°C, and the heat preservation reaction is carried out for 7 hours. After testing, the content of -NCO is 24.5%, and then 0.4g of p-benzoic acid inhibitor is added , turn on the vacuum, vacuumize for 2h under the condition of 600mmHg, extract the above-mentioned unreacted reactant, and obtain the multimer of isocyanate (the yield is 75%, the content of free HDI is 0.23%, and the content of -NCO is 20.8%) .

[0042](2) Take 200g (molecular weight 1000, 0.2mol) of polyether polyol and add it to ...

Embodiment 2

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

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

[0046] (2) Take 200g (molecular weight 1000, 0.2mol) polyether polyol (polymer of polypropylene oxide) and add in the reactor, heat up to 80 ℃, add 43.8g methyl d...

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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 pigments and fillers are not well dispersed in the system, they will cause many defects--- --Large color deviation, unevenness, non-delicacy, unattractive, sedimentation, flocculation, poor stability, poor quality, poor appearance, poor performance, etc.; using a good dispersant can prevent the pigment from settling and flocculating in the system, and improve the pigment and filler. In the system, it has the advantages of stability, color development, dispersion, aesthetics, cost reduction, and production efficiency improvement. According to the structural chara...

Claims

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Application Information

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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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