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A Method for Changing the Curing Speed ​​of Raw Lacquer

A curing speed and raw lacquer technology, applied in the direction of natural resin coatings, coatings, etc., can solve the problems of reducing the polymerization rate, paint liquid dead paint, high labor costs, etc., to prolong and restore the drying time, slow down the curing speed, and effectively dry the time Effect

Active Publication Date: 2022-06-28
MINJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As the saying goes, "A hundred miles, a thousand dollars, a catty of paint", but for the active system, the loss caused by the automatic polymerization of the paint liquid during storage, transportation and use cannot be ignored
At the same time, the output of paint liquid is low and the labor cost is high, making paint liquid a rare material with high price
Therefore, reducing the polymerization rate, prolonging the storage time, and improving the utilization rate of the paint solution are one of the problems waiting to be solved.
On the other hand, due to improper storage or long storage time, the paint solution becomes dead paint or old paint, resulting in the inactivation of part of the laccase activity
There is currently no report on the study of prolonging the curing time of raw lacquer to improve storage time

Method used

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  • A Method for Changing the Curing Speed ​​of Raw Lacquer
  • A Method for Changing the Curing Speed ​​of Raw Lacquer
  • A Method for Changing the Curing Speed ​​of Raw Lacquer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of embodiment 1 blank paint film

[0037] (1) The original raw lacquer is filtered with a filter tool to remove branches and other impurities in the original paint solution. The filter tool used is a simple filter tool assembled with 100-mesh gauze and absorbent cotton. The paint solution with a solid content of 66.25% is placed In a beaker, stirring at 35°C and 120 r / min until the solid content is about 75% to obtain a refined raw lacquer, and the refined raw lacquer is sealed and stored after the reaction;

[0038] (2) Using the refined raw lacquer as the raw material, use a 75 μm film applicator to coat the surface of the tinplate sheet to make the wet thickness of the paint film 75 μm, and then put the obtained sample into a constant temperature and humidity box (T=25°C, RH= 80%) was dried and recorded as sample RL. Before coating, the tinplate sheets were polished with 100-mesh and 240-mesh sandpaper in turn, and then cleaned with absolute ethanol....

Embodiment 2

[0039] The preparation of embodiment 2 raw lacquer and inorganic salt composite coating

[0040] (1) The original raw lacquer is filtered with a filter tool to remove branches and other impurities in the original paint solution. The filter tool used is a simple filter tool assembled with 100-mesh gauze and absorbent cotton. The paint solution with a solid content of 66.25% is placed In a beaker, stirring at 35°C and 120 r / min until the solid content is about 75% to obtain a refined raw lacquer, and the refined raw lacquer is sealed and stored after the reaction;

[0041] (2) Inorganic salts (sodium chloride, potassium chloride, copper chloride, calcium chloride, magnesium chloride, sodium sulfate, potassium sulfate, copper sulfate, sodium phosphate, sodium nitrate, sodium bicarbonate, sodium carbonate, potassium carbonate, Sodium sulfite or sodium bisulfite) and raw lacquer are mixed in a beaker in proportion, and magnetically stirred at 25 ° C for 1 h. The obtained sample is ...

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Abstract

The invention discloses a method for changing the curing speed of raw lacquer, which belongs to the technical field of polymer coatings. Inorganic salts are added to the raw lacquer, and the inorganic salts include sodium chloride, potassium chloride, copper chloride, calcium chloride, magnesium chloride, One or more of sodium sulfate, potassium sulfate, copper sulfate, sodium phosphate, sodium nitrate, sodium bicarbonate, sodium carbonate, potassium carbonate, sodium sulfite or sodium bisulfite, the present invention for the first time without destroying the "water-in-oil" Under the premise of the emulsion structure, the laccase activity is adjusted with inorganic salts to achieve the extension and recovery of the paint liquid drying time, which can avoid the waste of the conjunctiva caused by the long-term storage and transportation of the paint liquid. And / or sodium chloride can restore or shorten the drying time of the paint solution.

Description

technical field [0001] The invention relates to the technical field of polymer coatings, in particular to a method for changing the curing speed of raw paint. Background technique [0002] Raw lacquer is widely used in the preparation of arts and crafts and the coating industry because of its excellent quality. It is a VOC-free, high-solids, natural and renewable green adhesive and coating. The oxidative polymerization of raw lacquer is in the presence of oxygen and water, Cu in laccase 2+ Catalytic polymerization to generate urushiol semiquinone free radicals, urushiol semiquinone free radicals are unstable and highly active, and further react with urushiol to generate urushiol dimers, and then carry out free radical chain reaction to catalyze the oxidative polymerization of urushiol. A reticulated urushiol polymer is generated, and on this basis, the unsaturated double bonds of the urushiol side chain continue to react to form a stereo-configuration polymer. Therefore, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D193/00C09D7/61
CPCC09D193/00C09D7/61C08K2003/162C08K2003/166C08K2003/3045C08K2003/324C08K2003/262C08K3/16C08K3/30C08K3/32C08K3/28C08K3/26
Inventor 徐艳莲郑斌斌林棋郑国才
Owner MINJIANG UNIV
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