Preparation method of unsaturated hyperbranched polyester-modified wood coating

A hyperbranched polyester and wood coating technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high film brittleness, sticky surface, long curing time, etc., and achieve low shrinkage and anti-fouling The effect of improving the property and accelerating the curing speed

Inactive Publication Date: 2018-09-21
WUHU BAOYI AMUSEMENT EQUIP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method of an unsaturated hyperbranched polyester modified wood coating, which overcomes the disadvantages of the traditional unsaturated polyester wood primer, such as large film brittleness, long curing time, and easy stickiness of the surface cured at low temperature.

Method used

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Experimental program
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Embodiment 1

[0022] A kind of preparation method of unsaturated hyperbranched polyester modified wood coating, concrete steps are as follows:

[0023] (1) Modified SiO 2 Intermediates:

[0024] Take 2g of nano-silica with a particle size of 300 nm and a surface hydroxyl content of 1.0mmol / g. After vacuum drying at 110°C, disperse in DMF and ultrasonically disperse for 20 minutes to obtain a suspension; add to the constant pressure dropping funnel Appropriate amount of DMF, 3.5g diisocyanate and 0.2g DBTDL were slowly added dropwise to the silica suspension at 70°C, and stirred for 3 hours;

[0025] (2) Add 65g of IPDI (isophorone diisocyanate) and 0.4g of DBTDL catalyst into a four-necked flask equipped with a reflux condenser, a thermometer, and a stirrer, and slowly add 62g of TMPDE (trimethylol Propane diallyl ether), reacted at 35°C for 4h, until the -NCO value was half of the initial value, that is, stopped the reaction, and obtained IPDI-TMPDE prepolymer;

[0026] (3) Nano-silica ...

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Abstract

The invention discloses a preparation method of an unsaturated hyperbranched polyester-modified wood coating. The preparation method is characterized in that a SiO2 intermediate with a high reactivity-NCO group on the surface is added by utilizing the reaction between hydroxyl and a CNO group and participates in the reaction of trimethylolpropane diallyl ether and a diisocyanate polymer with hydroxyl terminated hyperbranched polyester, so that silicon dioxide-grafted hyperbranched unsaturated resin is prepared; then the obtained hyperbranched unsaturated resin is used for modifying linear unsaturated polyester to obtain the unsaturated polyester coating. The preparation method disclosed by the invention has the benefits that a nanotechnology and a hyperbranched technology are combined; after the nanometer silicon dioxide-grafted hyperbranched unsaturated polymer is added, the bonding strength, the smoothness, the anti-fouling property and other properties between a coating layer and asubstrate can be improved; a hyperbranched multi-branched chain structure can form an interpenetrating network with a linear unsaturated polyester molecular chain, so that the cross-linking density ishigher; the obtained unsaturated resin coating has excellent properties such as fast curing and good toughness.

Description

technical field [0001] The invention relates to the technical field of unsaturated polyester coatings, in particular to a preparation method of unsaturated hyperbranched polyester modified wood coatings. Background technique [0002] Due to its high hardness, high gloss, good fullness, excellent chemical resistance, low cost and easy processing, unsaturated polyester coatings are widely used on the surface of high-end furniture and musical instruments. However, the coating film is brittle and Poor impact resistance, large curing shrinkage, low-temperature curing surface is easy to stick and other defects, domestic and foreign researchers have done a lot of work to overcome these defects, such as introducing allyl ether, tung oil, linseed oil and other air-drying properties into the molecular chain group, so that the surface of the coating can be cured well in the air; it is modified by using flexible materials such as polyurethane to overcome the defect of high brittleness o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C08G18/75C08G18/67C08G18/42C08G18/38C08G18/10
CPCC09D175/14C08G18/10C08G18/4286C08G18/676C08G18/755C08G18/42C08G18/3895
Inventor 张庆
Owner WUHU BAOYI AMUSEMENT EQUIP
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