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Method for changing curing speed of raw lacquer

A technology of curing speed and raw lacquer, applied in the direction of natural resin coatings, coatings, etc., can solve the problems of reducing polymerization rate, dead paint, high labor cost, prolonging and recovering drying time, slowing curing speed, and effective drying time Effect

Active Publication Date: 2021-10-01
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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  • Method for changing curing speed of raw lacquer
  • Method for changing curing speed of raw lacquer
  • Method for changing 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 Stir in a beaker at 35°C and 120r / min until the solid content is about 75% to obtain refined lacquer, which is sealed and stored after the reaction;

[0038] (2) Using refined raw lacquer as raw material, use a 75 μm film applicator to coat the surface of the tinplate sheet so that the wet thickness of the paint film is 75 μm, and then put the obtained sample into a constant temperature and humidity box (T=25°C, RH= 80%) dry, denoted as sample RL. Before coating, the tinplate sheet was 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 Stir in a beaker at 35°C and 120r / min until the solid content is about 75% to obtain refined lacquer, which 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 were mixed in a beaker in proportion, stirred magnetically for 1 hour at 25°C, and the obtained sample was sealed and stored as ML (无机盐) ...

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Abstract

The invention discloses a method for changing the curing speed of raw lacquer, and belongs to the technical field of polymer coatings.Inorganic salt is added into the raw lacquer. The inorganic salt comprises one or more of 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 hydrogen sulfite. On the premise of not destroying the structure of the water-in-oil emulsion, the laccase activity is regulated by using inorganic salt for the first time; The drying time of the paint liquid is prolonged and recovered, the problem of film formation waste caused by long-term storage and transportation of the paint liquid can be avoided, but the drying time of the paint liquid can be recovered or shortened by adding sodium carbonate and / or sodium chloride again in actual use.

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 lacquer. Background technique [0002] Because of its excellent quality, raw lacquer is widely used in the preparation of arts and crafts and the coating industry. It is a VOC-free, high-solid, natural and renewable green adhesive and coating. Oxidative polymerization of 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, further react with urushiol to form urushiol dimers, and then carry out free radical chain reaction catalytic oxidation polymerization Urushiol oxidative polymerization Generate reticular urushiol high molecular polymer, on this basis, the unsaturated double bond of urushiol side chain continues to react to form stereo configuration polymer. Therefore, lac...

Claims

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Application Information

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Patent Type & Authority Applications(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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