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Method for preparing polyurethane, and polyurethane prepared from the method, and usage

A polyurethane and trimer technology, applied in chemical instruments and methods, transportation and packaging, dissolution and other directions, can solve the problems of insufficient stability of heterocyclic organic pigments and inability to play a stabilizing role, and achieve good adsorption stability and good adsorption. Stable performance and improved tolerance

Inactive Publication Date: 2007-05-09
王志军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polymer product in this prior art has dispersion stabilization effect on organic pigments and inorganic pigments, it is insufficient in stabilizing ability to heterocyclic organic pigments such as phthalocyanines, quinacridones, dioxazine violet, etc. In an acidic environment, it can hardly play a stabilizing role

Method used

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  • Method for preparing polyurethane, and polyurethane prepared from the method, and usage
  • Method for preparing polyurethane, and polyurethane prepared from the method, and usage
  • Method for preparing polyurethane, and polyurethane prepared from the method, and usage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Table 1

[0039] raw material

Dosage

IPDI homotrimer ①

PEG2000

Polyε-caprolactone monohydric alcohol (M w =1500)

Benzotriazole

Dibutyltin dilaurate

mixed solvent ②

1.0mol

0.3mol

1.0mol

0.25mol

Accounting for 0.05wt% of the total amount of the above 4 raw materials

4000g

[0040] ① IPDI homotrimer was purchased from Degussa Company, trade name T1890;

[0041] ② A mixed solvent of isobutanol and propylene glycol methyl ether acetate with a weight ratio of 1:1.

[0042] The PEG2000 was dehydrated under vacuum at 115°C for 3 hours to obtain dry PEG2000, which was set aside. In the dry four-neck bottle reaction bottle that stirrer, dropping funnel, condenser and thermometer are equipped with, add IPDI homopolymerization trimer, account for the solvent of 70% solvent total amount, catalyzer dibutyl tin dilaurate, pass Under the protection of nitrogen, stir and heat to 75°C; slowly add polyε-ca...

Embodiment 2

[0045] ③A mixed solvent of isobutanol and propylene glycol methyl ether acetate with a weight ratio of 1:1

[0046] The PEG2000 was dehydrated under vacuum at 115°C for 3 hours to obtain dry PEG2000, which was set aside. In the dry four-neck bottle reaction bottle that stirrer, dropping funnel, condenser and thermometer are equipped with, add IPDI homopolymerization trimer, account for the solvent of 70% solvent total amount, catalyzer dibutyl tin dilaurate, pass Under nitrogen protection, stir and heat to 75°C; slowly add polyε-caprolactone monohydric alcohol and a mixed solvent accounting for 10% of the total solvent to the reaction flask, and react at 80°C for 1 hour; then dehydrated PEG2000 and account for the total solvent Mix 15% of the solvent evenly and add it dropwise into the reaction bottle, react at 80°C for 1 hour; slowly raise the temperature to 90°C and keep it warm for 1 hour; finally cool down to 80°C, add the mixture of imidazole and the remaining solv...

Embodiment 3

[0049] ④ A mixed solvent of isobutanol and propylene glycol methyl ether acetate with a weight ratio of 1:1

[0050] The PEG2000 was dehydrated under vacuum at 115°C for 3 hours to obtain dry PEG2000, which was set aside. In the dry four-neck bottle reaction bottle that stirrer, dropping funnel, condenser and thermometer are equipped with, add IPDI homopolymerization trimer, account for the solvent of 70% solvent total amount, catalyzer dibutyl tin dilaurate, pass Under nitrogen protection, stir and heat to 75°C; slowly add polyε-caprolactone monohydric alcohol and a mixed solvent accounting for 10% of the total solvent to the reaction flask, and react at 80°C for 1 hour; then dehydrated PEG2000 and account for the total solvent Mix 15% of the solvent evenly and add it dropwise into the reaction bottle, react at 80°C for 1 hour; slowly raise the temperature to 90°C and keep it warm for 1 hour; finally cool down to 80°C, add the mixture of triazine and the remaining solv...

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Abstract

This invention discloses a method for preparing polyurethane and its application. The method comprises: (1) heating polyisocyanate trimer, solvent (70-90% of the total amount), and catalyst to 70-80 deg.C under nitrogen protection, and stirring; (2) adding monofunctional end-capping agent and solvent (5-15% of the total amount), and reacting at 78-82 deg.C; (3) adding polyether diol monomer and solvent (10-20% of the total amount), and reacting at 78-82 deg.C; (4) adding N-heterocyclic compound end-capping agent and the rest solvent, and reacting at 78-82 deg.C. The obtained polyurethane can be used as paint dispersant, and has strong adsorbency to fused ring organic paints, and high acidic tolerance.

Description

technical field [0001] The invention relates to a method for preparing polyurethane, the polyurethane obtained by the method and its use as a pigment dispersant. Background technique [0002] At present, the world output of organic pigments is huge, accounting for more than 30% of the world's dyestuff output. The output of organic pigments in my country has grown by leaps and bounds in recent years. The development of organic pigment technology is mainly to meet the high-grade requirements of users, and at the same time develop products with special application properties. Organic pigments are different from water-soluble dyes: water-soluble dyes color fiber materials through chemical reactions in aqueous solutions or dispersion suspensions; organic pigments are insoluble in the medium of use (such as: water, organic solvents or resins), but mechanically dispersed with fine particles in the coloring medium. Therefore, the dispersion stability of organic pigments is an urge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/72C08G18/48B01F17/52C09K23/52
Inventor 王志军
Owner 王志军
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