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Room temperature self-crosslinking type PUA-SiO2 hybrid emulsion and preparation method thereof

A self-crosslinking, room temperature technology, applied in the direction of coating, etc., can solve the problems of coating film performance and construction, cost, high glass transition temperature, low hardness, etc., to improve storage stability and simplify the preparation process , Excellent reinforcing effect

Active Publication Date: 2017-09-26
NANJING CHANGJIANG PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the glass transition temperature (T g ) is high, and there are many defects such as hot stickiness, cold brittleness and flexibility deviation
Third, it is difficult to take into account the film performance, workability, and cost. One-component room temperature self-drying water-based wood coatings that are convenient for construction generally have defects such as low hardness, easy scratching, and heat resistance.

Method used

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  • Room temperature self-crosslinking type PUA-SiO2 hybrid emulsion and preparation method thereof
  • Room temperature self-crosslinking type PUA-SiO2 hybrid emulsion and preparation method thereof
  • Room temperature self-crosslinking type PUA-SiO2 hybrid emulsion and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0029] (1) Preparation of polyurethane macromonomer aqueous dispersion: Add 80 mass parts of molecular weight to 500 hydroxyl polypropylene glycol, 2 mass parts of 1,4-butanediol, 8 mass parts of dihydroxypolypropylene glycol in the nitrogen-protected reactor Methylpropionic acid was dehydrated under vacuum at 105°C for 1.5h. The temperature was lowered to 55° C., 10 parts by mass of N-methylpyrrolidone and 160 parts by mass of acetone were added and stirred until the raw materials were dissolved. 70 parts by mass of isophorone diisocyanate was diluted with 140 parts by mass of acetone, and then slowly dropped into the reactor. Subsequently, 0.5 parts by mass of di-n-butyltin dilaurate was added, and the reaction was stirred for 3 h. Cool to 50° C., add 0.3 parts by mass of hydroquinone, dropwise add 17.2 parts by mass of β-hydroxyethyl acrylate, drop it in 20 minutes, and continue the reaction for 3 hours. Add 35 parts by mass of acetone and 8 parts by mass of triethylamine...

Embodiment 2

[0034] (1) Preparation of polyurethane macromonomer water dispersion: add 80 mass parts of molecular weight to 1500 hydroxypolyethylene glycol, 4 mass parts of 1,6-hexanediol, 4 mass parts of Dimethylolbutyric acid was vacuum dehydrated at 105°C for 2h. Cool down to 75°C, add 200 parts by mass of butanone and stir until the raw materials are dissolved. 35 parts by mass of isophorone diisocyanate was diluted with 80 parts by mass of methyl ethyl ketone, and then slowly dropped into the reactor. Subsequently, 1.5 parts by mass of di-n-butyltin dilaurate was added, and the reaction was stirred for 3 hours. Cool to 50° C., add 0.2 parts by mass of hydroquinone, dropwise add 8 parts by mass of β-hydroxyethyl acrylate, drop it in 20 minutes, and continue the reaction for 3 hours. Add 70 parts by mass of butanone and 3 parts by mass of triethylamine, and neutralize for 20 minutes. Add 310 parts by mass of distilled water and disperse at high speed for 20 minutes. A thin film evap...

Embodiment 3

[0039] (1) Preparation of polyurethane macromonomer aqueous dispersion: Add 80 mass parts molecular weight to 1000 hydroxyl polyethylene glycol, 8 mass parts of 1,6-hexanediol, 6 mass parts of Dimethylolpropionic acid was dehydrated under vacuum at 110°C for 1h. The temperature was lowered to 75° C., 10 parts by mass of N-methylpyrrolidone and 120 parts by mass of methyl ethyl ketone were added and stirred until the raw materials were dissolved. Dilute 50 parts by mass of toluene diisocyanate with 100 parts by mass of butanone, and then slowly drop it into the reactor. Subsequently, 1 mass part of di-n-butyltin dilaurate was added, and the reaction was stirred for 3 hours. Cool to 50° C., add 0.5 parts by mass of hydroquinone, dropwise add 23 parts by mass of β-hydroxyethyl acrylate, drop it in 20 minutes, and continue the reaction for 3 hours. Add 50 parts by mass of butanone and 6 parts by mass of triethylamine, and neutralize for 20 minutes. Add 400 parts by mass of dist...

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Abstract

The invention discloses a room temperature self-crosslinking type PUA-SiO2 hybrid emulsion and a preparation method thereof. The hybrid emulsion consists of a core-shell type waterborne polyurethane-polyacrylate copolymer, functional nanosilicon dioxide and water. Different from traditional blend doping, the PUA-SiO2 hybrid emulsion disclosed by the invention realizes filler reinforcing through chemical bonding generated by self-crosslinking. In the film-forming stage of the hybrid emulsion, a firm organic-inorganic hybrid network is formed among organic and inorganic components through coupled reactions of acetylacetic ester units and primary amines, so that the hybrid emulsion has the excellent characteristics of high film hardness, scratch resistance, water resistance, chemical product resistance, heat resistance and the like. The hybrid emulsion is applicable for high-performance water-based coatings, and is particularly applicable for product preparation of water-based wood coatings.

Description

technical field [0001] The invention relates to a room-temperature self-crosslinking organic-inorganic hybrid emulsion applied to water-based wood coatings and a preparation method thereof. Background technique [0002] Volatile organic compounds (VOC), as one of the important causes of haze, are the focus of current national air pollution control. Statistics show that my country's current VOC emissions reach 20-30 million tons per year. Due to the large amount of organic substances such as aromatic hydrocarbons, alkanes, ketones and esters used as diluents in the coating industry, the annual VOC emissions are as high as 7 million tons. To this end, the state has introduced policies and regulations such as VOC emission restrictions to promote the environmental protection upgrade of the coatings industry. For example, in September 2013, the "Action Plan for the Prevention and Control of Air Pollution" issued by the State Council clearly stated that it is necessary to improv...

Claims

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Application Information

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IPC IPC(8): C09D151/08C09D7/12C08K9/06C08K3/36C08L51/08C08G18/48C08G18/66C08G18/76C08G18/75C08G18/67C08F283/00C08F220/26C08F220/18C08F220/14C08F220/06C08F212/08
CPCC08F283/008C08G18/4825C08G18/4833C08G18/6674C08G18/6692C08G18/672C08G18/755C08G18/7614C08K3/36C08K9/06C08L51/08C09D151/08C08F220/1804
Inventor 陈钊聪张卫中
Owner NANJING CHANGJIANG PAINT
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