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Multiple crosslinking ultraviolet light solidifying water polyurethane dispersoid and its preparation method and application

A water-based polyurethane and multiple cross-linking technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve product safety and hygiene and long-term adverse effects on performance, environment and human harmful organic volatiles, and active diluents to increase the coating film Shrinkage and other issues, to achieve the effect of mature and stable production process, good molecular structure, and increase hardness

Inactive Publication Date: 2010-12-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reactive diluent monomer is used in a small amount, has low volatility, has little environmental pollution, and becomes a part of the coating film after curing, it has a strong odor and is irritating to the skin. The diluent is completely cured, and the residual reactive diluent monomer will have a negative impact on the safety, sanitation and long-term performance of the product, and the reactive diluent will increase the shrinkage of the coating film and reduce the physical properties of the coating film
Traditional solvent-based UV-curable coatings have to add some solvents, active monomers or multifunctional acrylates to adjust the viscosity of the coatings during production, construction and use, resulting in organic volatiles that are harmful to the environment and humans.

Method used

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  • Multiple crosslinking ultraviolet light solidifying water polyurethane dispersoid and its preparation method and application
  • Multiple crosslinking ultraviolet light solidifying water polyurethane dispersoid and its preparation method and application
  • Multiple crosslinking ultraviolet light solidifying water polyurethane dispersoid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The multi-crosslinking UV-curable waterborne polyurethane wood coating was prepared according to the following steps.

[0052] Prepare raw materials: Prepare materials according to the formula in Table 1.

[0053] Table 1

[0054]

[0055]

[0056] Synthesis of polyurethane primary polymer I: firstly add polyether N210 into the reaction vessel, heat up to 70°C, then add toluene diisocyanate, stir and react for 2 hours to obtain reactive primary polymer I;

[0057] Synthesis of polyurethane prepolymer II: Add dropwise a mixture of 1,4-butanediol, trimethylolpropane, glycerol, N-methylpyrrolidone and acetone to the resulting initial polymer I, and control the dropping time Control within 2 hours; after the dropwise addition is completed, react for 1 hour in the temperature range of 80°C, and the polyurethane prepolymer II is obtained after the reaction is completed;

[0058] Synthesis of polyurethane prepolymer III: dissolve the dried 2,2-dimethylolpropionic ac...

Embodiment 2

[0065] Raw materials were prepared according to the ratio in Table 2 below, and then the same steps as in Example 1 were used to prepare multiple cross-linked UV-curable water-based polyurethane wood coatings.

[0066] Table 2

[0067]

[0068]

[0069] Synthesis of polyurethane primary polymer I: firstly add polyether N220 into the reaction vessel, heat up to 90°C, then add toluene diisocyanate, stir and react for 1 hour to obtain reactive primary polymer I;

[0070] The synthesis of polyurethane prepolymer II: dropwise the mixture of 1,4-butanediol, pentaerythritol, N-methylpyrrolidone and acetone in the initial polymer I of gained, control dropping time is controlled at 1.5 hours; After the addition is completed, react for 2 hours in the temperature range of 70°C, and the polyurethane prepolymer II is obtained after the reaction is completed;

[0071] Synthesis of Polyurethane Prepolymer III: Dissolve the dried 2,2-dimethylol propionic acid and epoxy resin E-20 mixt...

Embodiment 3

[0078] Raw materials were prepared according to the ratio in Table 3 below, and then the multiple cross-linked UV-curable waterborne polyurethane wood coating was prepared according to the same steps as in Example 1.

[0079] table 3

[0080]

[0081]

[0082] Synthesis of polyurethane primary polymer I: firstly add polyether N230 into the reaction vessel, heat up to 80°C, then add toluene diisocyanate, stir and react for 1.5 hours to obtain reactive primary polymer I;

[0083] The synthesis of polyurethane prepolymer II: dropwise the mixture of 1,4-butanediol, glycerol, N-methylpyrrolidone and acetone in the obtained primary polymer I, control the time of dropping and control at 1 hour; drop After the addition is completed, react within the temperature range of 80°C for 1 hour, and the polyurethane prepolymer II is obtained after the reaction is completed;

[0084] Synthesis of Polyurethane Prepolymer III: Dissolve the dried 2,2-dimethylol propionic acid and epoxy r...

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Abstract

The invention discloses a multiple crosslink ultraviolet solidification aqueous polyurethane disperser, a corresponding preparation method and an application. The preparation method comprises synthesizing polyurethane initial polymerized compound I, synthesizing polyurethane prepolymer II, synthesizing polyurethane prepolymer III, synthesizing polyurethane acrylate oligomer and synthesizing ultraviolet solidification aqueous polyurethane disperser. The invention mainly utilizes aromatic diisocyanate, diatomic alcohol prepolymer, polyhydroxy carboxylic acid, epoxy resin and hydroxyl acrylate as raw materials, with better water dispersity and storage stability, which leads in light inducer, levelling agent, defoaming agent and thickener to prepare ultraviolet solidification aqueous wood paint better than solvent ultraviolet solidification photosensitive resin, with stable storage, low fineness, high rigidity, high brightness, better flow leveling property, better water resistance, better solvent resistance, excellent abrasion resistance, environment protection, easy process and fire hazard resistance.

Description

technical field [0001] The present invention relates to a new type of coating: water-based polyurethane wood coating, in particular to a method for preparing a green and environment-friendly multi-crosslinked UV-curable water-based polyurethane dispersion, and the UV-curable water-based polyurethane wood coating prepared from this dispersion. coating. Background technique [0002] With the progress of society and the improvement of human awareness, people have gradually realized the high hazards of solvent-based coatings, that is, the discharge of a large number of volatile organic compounds will damage the earth's ecological environment and the heavy metals used in coatings will affect the further development of human beings. the threat posed. [0003] The formulation system of solvent-based UV-curable coatings usually consists of photoinitiators, reactive oligomers, reactive diluent monomers and organic solvents to adjust the viscosity of the formulation. Although the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03C08G18/10C08G18/63C08G18/83C09D175/14C09D7/12
Inventor 叶代勇张心亚夏正斌沈慧芳陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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