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Tung-oil-based biodegradable UV curing adhesive, and preparation method and application thereof

A biodegradable and curing adhesive technology, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems that polyurethane acrylate adhesives do not have biodegradability and are not UV-curable, and achieve The effect of excellent biodegradability

Active Publication Date: 2017-09-22
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent with the publication number CN106256844A discloses a preparation method of biodegradable polyurethane resin. The raw material used in this method is guar gum, a biomass material, but the prepared polyurethane is a solid resin and is not UV-cured.
In addition, Chinese invention patents with publication numbers of CN105801791A, CN105566396A, CN103193678A, CN102911338A, etc. involve the preparation of UV-curable polyurethane acrylate, but none of them use vegetable oil-based polyols to replace petrochemical polyols to prepare PUA. Therefore, the prepared polyurethane acrylic acid Ester adhesives are not biodegradable

Method used

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  • Tung-oil-based biodegradable UV curing adhesive, and preparation method and application thereof
  • Tung-oil-based biodegradable UV curing adhesive, and preparation method and application thereof
  • Tung-oil-based biodegradable UV curing adhesive, and preparation method and application thereof

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preparation example Construction

[0071] Vegetable oil-based polyols can be prepared by the following methods:

[0072] (1) Synthesis and separation and purification of methyl trophic acid: Add 43.6 g of tung oil (0.05 mol, tung oil is calculated as glyceryl citric acid ester (872)) into a 250 mL three-necked flask, install a condensing reflux device, and heat a constant temperature water bath to 80 °C Afterwards, add the NaOH / methanol solution (0.436g / 9.6g) that prepares, wherein methyl alcohol: tung oil=6:1 (mol / mol), methyl alcohol 0.3mol (9.6g); NaOH is 1% (0.436g) of tung oil quality ); turn on the magnetic stirring, and stop the reaction after reacting for about 1 hour; add an appropriate amount of phosphoric acid to neutralize, transfer the reaction solution to a separatory funnel while it is hot, let it stand, and separate the glycerin layer (lower layer); wash the upper layer of liquid with hot distilled water 3 to 4 times, remove the water phase in the lower layer, distill under reduced pressure to r...

Embodiment 1

[0076] (1) Synthesis and separation and purification of tung oil ester alcohol: after heating tung oil to 60°C, add an alkaline solution of ethylene glycol, the molar ratio of the two is 6:1, under the condition of stirring, reflux reaction for 80min, and then Add an appropriate amount of acid to neutralize, let the reaction solution stand still, separate the layers, and separate the lower glycerin layer; then wash the upper liquid with water, remove the lower water phase, and distill under reduced pressure to remove ethylene glycol and most of the water, etc., and finally Dried to obtain oleic acid ester alcohol;

[0077] (2) Synthesis of vegetable oil-based PU prepolymer: Add vegetable oil-based polyols in sequence in the reactor, stir and heat up to 115°C, dehydrate under reduced pressure for 2 hours and then cool down to 65°C, then add hexamethylene diisocyanate and diisocyanate For the mixture of dibutyltin laurate, pay attention to control its dropping rate, preferably d...

Embodiment 2

[0082] (1) Synthesis and separation and purification of tung oil ester alcohol: after heating tung oil to 80°C, add an alkaline solution of ethylene glycol, the molar ratio of the two is 6:1, under the condition of stirring, reflux reaction for 50min, and then Add an appropriate amount of acid to neutralize, let the reaction solution stand still, separate the layers, and separate the lower glycerin layer; then wash the upper liquid with water, remove the lower water phase, and distill under reduced pressure to remove ethylene glycol and most of the water, etc., and finally Dried to obtain oleic acid ester alcohol;

[0083] (2) Synthesis of vegetable oil-based PU prepolymer: Add vegetable oil-based polyols in sequence in the reactor, stir and heat up to 125°C, dehydrate under reduced pressure for 3 hours and then cool down to 75°C, then add toluene diisocyanate and dilauric acid diisocyanate For the mixture of butyltin, pay attention to control the dropping rate, preferably dro...

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Abstract

The invention belongs to the technical field of UV curing high polymer materials, and discloses a tung-oil-based biodegradable UV curing adhesive, and a preparation method and application thereof. The preparation method provided by the invention comprises the following steps of (1) heating tung oil to 60 to 80 DEG C; then, adding an alkaline solution of ethylene glycol; under the stirring condition, performing backflow reaction for 50 to 80 min to obtain ethanol eleostearate; (2) adding a mixture of diisocyanate and a catalyst into preheated plant oil-based polyhydric alcohol; performing heat insulation reaction for 2 to 4h to obtain an intermediate product; lowering the temperature; adding the ethanol eleostearate in the step (1); performing reaction for 2 to 3h to obtain a prepolymer; (3) mixing the prepolymer in the step (2), an active diluent and an auxiliary agent; or adding a cationic photoinitiator and a free radical photoinitiator; performing uniform stirring to obtain the UV curing adhesive. Under the UV illumination, the UV curing adhesive can be fast cured into a film under the initiation effects of an aerobic nonluminous initiator or the cationic photoinitiator and the free radical photoinitiator.

Description

technical field [0001] The invention belongs to the technical field of UV curing polymer materials, in particular to a tung oil-based biodegradable UV curing adhesive and its preparation method and application. Background technique [0002] UV curing adhesive is a kind of adhesive that makes the bonded substrate quickly produce bonding performance under the action of ultraviolet light energy. Although the proportion of UV curing adhesives in the entire adhesive market is not high, UV curing adhesives have achieved rapid development at home and abroad due to their advantages such as fast curing speed, low curing temperature, no pollution, and energy saving, and have been widely used in printed circuit boards. Manufacturing, optical fiber bonding, liquid crystal display installation, electronic component assembly and other fields, especially in places where traditional adhesives cannot be used, such as high-precision electronic equipment or the bonding of heat-sensitive substr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C08G18/80C08G18/67C08G18/36C08G18/12
CPCC08G18/36C08G18/8051C08G2230/00C09J175/14
Inventor 袁腾梁斌杨卓鸿张超群黄家健张淑婷
Owner SOUTH CHINA AGRI UNIV
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