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Normal-temperature multiple curing organic-inorganic hybridized aqueous nano polyurethane woodware coating and preparation method thereof

A multi-curing, wood coating technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of long drying time of water-based wood coatings, pollution of light-curing coating thinner, substandard coating performance, etc., to achieve adhesion Strong force, convenient construction, good weather resistance and adhesion

Inactive Publication Date: 2010-08-11
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems existing in existing water-based wood coatings and light-cured wood coatings, the purpose of the present invention is to provide a multi-curing organic-inorganic hybrid water-based nano-polyurethane wood coating at room temperature and its preparation method to solve the problem of VOC in traditional solvent-based wood coatings. Serious pollution, and the current water-based wood coatings have long drying time, poor stability, substandard coating performance, and pollution of light-curing coating thinners, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Preparation of polyurethane prepolymer

[0046] Add PCDL with a molecular weight of 1000 to a reaction kettle equipped with a condensing device, an electric stirrer, and a temperature control device, dehydrate at a speed of 200r / min, a vacuum of 0.08MPa, and a temperature of 120°C for about 30 minutes, and then cool down to 30°C left and right, press n NCO / n OH = Add MDI at a molar ratio of 4:1, and dropwise add 0.3% of the mass of MDI dibutyltin dilaurate, slowly raise the temperature to about 80°C, and react for about 90 minutes to obtain a polyurethane prepolymer.

[0047] (2) Preparation of organic-inorganic hybrid nano prepolymer

[0048] Cool down to about 30°C, add 8% methyl ethyl ketone to dilute and disperse the prepolymer mass, add 0.5% trimethylolpropane, 3% neopentyl glycol, 5% nano-silicon dioxide, drop 0.3 % of dibutyltin dilaurate catalyst, slowly warming up to about 70°C and reacting for about 180min to obtain an organic-inorganic hybrid nano po...

Embodiment 2

[0069] (1) Preparation of polyurethane prepolymer

[0070] Add PPG with a molecular weight of 2000 to a reaction kettle equipped with a condensing device, an electric stirrer, and a temperature control device, dehydrate at a speed of 200r / min, a vacuum of 0.06MPa, and a temperature of 115°C for 40 minutes, and then cool down to about 30°C , after feeding nitrogen for 40 minutes, press n NCO / n OH = Add IPDI at a molar ratio of 3.5:1, and add dropwise 1% stannous octoate based on the mass of IPDI, raise the temperature to 85° C., and react for 100 minutes to obtain a polyurethane prepolymer.

[0071] (2) Preparation of organic-inorganic hybrid nano prepolymer

[0072] Cool down to 30°C, add 6% butanone, 0.4% trimethylolethane, 4% 1,4-butanediol, 4% nano titanium dioxide to the above prepolymer , heated up to 70°C and reacted for 120 minutes to obtain an organic-inorganic hybrid nano polyurethane prepolymer.

[0073] (3) Preparation of organic-inorganic hybrid nano-polyuret...

Embodiment 3

[0092] (1) Preparation of polyurethane prepolymer

[0093] Add PTG with a molecular weight of 1500 to a reaction kettle equipped with a condensing device, an electric stirrer, and a temperature control device, dehydrate at a speed of 200r / min, a vacuum of 0.05MPa, and a temperature of 130°C for 50 minutes, and then cool down to about 30°C , after feeding nitrogen for 30min, add molar ratio n NCO / n OH =3:1 Add HMDI, and dropwise add 0.5% stannous octoate based on the mass of HMDI, raise the temperature to 80° C., and react for 120 minutes to obtain a polyurethane prepolymer.

[0094] (2) Preparation of organic-inorganic hybrid nano prepolymer

[0095] Cool down to 30°C, add 5% butanone, 0.2% pentaerythritol, 6% diethylene glycol, and 6% nano-ZnO based on the total mass of PTG and HMDI, and heat up to 75°C for 120 minutes to obtain organic- Inorganic hybrid nano polyurethane prepolymer.

[0096] (3) Preparation of organic-inorganic hybrid nano-polyurethane prepolymers cont...

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Abstract

The invention discloses a normal-temperature multiple curing organic-inorganic hybridized aqueous polyurethane woodware coating and a preparation method thereof. The coating mainly contains organic-inorganic hybridized aqueous nano polyurethane latex, a film-forming assistant, a defoaming and foam inhibitor, a flatting agent, a base material wetting agent, a stable dispersing agent, a thickening agent and an aqueous photo initiator, wherein the organic-inorganic hybridized aqueous nano polyurethane latex is prepared by firstly obtaining a polyurethane prepolymer by pre-polymerizing, and then adding an inorganic nano material in an organic-inorganic hybridization way by an in-situ polymerization technology, and finally grafting a photo-curing end-capping agent containing active functional groups and C-C double bonds. The normal-temperature multiple curing organic-inorganic hybridized aqueous polyurethane woodware coating is obtained by adding and dispersing pigment fillings and an assistant evenly in the organic-inorganic hybridized aqueous nano polyurethane latex. The invention not only solves the pollution problem of a solvent-type VOC (Volatile Organic Compound) coating, but also solves the problem of aqueous coatings which have the defects of poor toughness and poor performances in weather resistance, aging resistance, acid resistance, alkaline resistance and solvent resistance.

Description

technical field [0001] The invention relates to a water-based polyurethane wood coating, in particular to a single-component system, multi-curing organic-inorganic hybrid water-based nano polyurethane wood coating at room temperature and a preparation method thereof. Background technique: [0002] China is the world's largest producer of furniture, with an annual output value of more than 500 billion and more than 5 million employees. The annual demand for wood coatings is about 700,000 tons, and it is growing at a rate of 15%-20% year by year. Nitro-based paints (NC), polyurethane coatings (PU), unsaturated polyester coatings (PE), and acid-curing coatings (AC) commonly used in the furniture industry are all solvent-based coatings, and a large amount of organic solvents ( VOC), such as toluene, xylene, dimethylformamide, etc., seriously pollute the environment and endanger human health. With the strengthening of people's awareness of environmental protection and the nation...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D175/16C09D7/12
Inventor 辛中印陈政黄美松张帆
Owner SICHUAN UNIV
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