CN85100264A - The light color of raw lacquer and color modified method - Google Patents

Abstract

The present invention proposes the light method of modifying of a class about raw lacquer.The main points of present method are, at first with the laccol epoxidation or be with other active group to destroy its quinhydrones structure, then laccol epoxy prepolymer etc. are made the unsaturated fatty chain epoxidation or are with other active group with the peroxy acid reaction.After modification, obtain containing the laccol performed polymer of multiple functional group.Solidifying the light modified raw lacquer of making has kept the premium properties of raw lacquer and original performance is made moderate progress.Modified raw lacquer divides drying-type, drying at room temperature type and doses improved plant oil type etc. multiple, and product does not have supersensitivity and can spray.Both can make varnish and use, also can be modulated into various colored lacquers.

Description

The light color of raw lacquer and color modified method

The chemical modification that the invention belongs to coating is handled.

Raw lacquer is the good lacquer that China produces.The raw lacquer output of China occupies first place in the world, and is traditional exported product always, at present main exit Japan and Southeast Asian countries.Raw lacquer gained paint film is black, also can be made into red-brown, because color depth is very limited its application.People attempt raw lacquer is made white or light color for a long time, to adapt to the needs that different surfaces applies, broadened application scope.Up to now, though the structure and the performance of raw lacquer have been done a large amount of research work both at home and abroad, the light modification of relevant raw lacquer fails to achieve satisfactory results always, and domestic and foreign literature is not seen open report as yet to this.Therefore, the research of the light method of modifying of raw lacquer becomes the great technical task that presses for solution.

The objective of the invention is raw lacquer to be carried out modification and handle, make the raw lacquer of black become light color or chromatic modified raw lacquer with chemical process.And the raw lacquer after the modification will keep original premium properties substantially, to other as be difficult for to apply, supersensitivity is strong, alkali resistance is relatively poor, fragility is big, shock resistance and sticking power performance such as strong, easy photoaging also should improve to some extent.

It is to contain a considerable amount of quinhydrones structures (sensitization of raw lacquer is also relevant therewith) in its polymerization product that the raw lacquer paint film is dark major cause.Therefore, thus key of the present invention is to manage to destroy the quinhydrones structure of raw lacquer laccol reaches the purpose of eliminating the raw lacquer color depth.In addition, for other performance such as alkali resistance, snappiness, shock resistance and the sticking power etc. that improve raw lacquer, and original premium properties of maintenance raw lacquer, then must be noted that the character of modified chemical group and whether help forming three-dimensional large network structure.At last, should also be noted that to reach and eliminate raw lacquer supersensitivity and make it make the form that is beneficial to spraying.

For achieving the above object, the contriver has taked following modification procedure:

1. laccol epoxidation or with other active group of going up hydroxyl reaches light purpose with the quinhydrones structure of destroying laccol.

2. laccol epoxidation or react with peroxy acid with the performed polymer of going up other active group and to make the further epoxidation of unsaturated fatty chain or to be with other active group.

3. for making epoxidation laccol performed polymer reach the crosslinking curing purpose, add different siccative or solidifying agent and make its self-vulcanizing or be heating and curing.Siccative or solidifying agent can be the combinations of two amines, T31 Resins, epoxy, multifunctional epoxide, phthalic acid, maleic anhydride, tolylene diisocyanate, tolylene diisocyanate resin, amino resin and these materials.Curing mode can be oven dry, drying at room temperature, also can illumination and ir radiation impel curing.

4. similar with raw lacquer, in above-mentioned modification light color raw lacquer, can add modified tung oil or other modified drying oil, make some improved performance and reduce cost.

Test result to physics, chemistry and the mechanical property of modified raw lacquer shows, by the light modification to raw lacquer, has obtained the laccol performed polymer of band various active functional group.Product can be from doing, add the light modified raw lacquer that siccative or solidifying agent are made, be better than raw lacquer in performances such as color and luster, glossiness, sticking power, snappiness, shock resistance, thermotolerance, alkali resistance, anti-light agings, hardness and raw lacquer are suitable, chemical resistance is good, and human body is not had sensitization.Can be deployed into different viscosity as required during coating, be beneficial to spraying.Can make varnish usefulness, also can add pigment or dyestuff and be modulated into various colored lacquers.

Can expect, because light color and color modified, raw lacquer will be subjected to the welcome of domestic and international market more, and will be used widely in industrial art, furniture manufacturing, indoor decoration, leather and fields such as leatheroid coating, instrument, shipbuilding and chemical industry.China's raw lacquer output is 50,000 load/year above (150 load/years of Japan), because products made thereby system is different from the expensive goods of synthetic lacquer, in present 19 yuan/kilogram, the output value has 5,000 ten thousand yuan, if increase by 20% by the output value, then can increase by 2,000 ten thousand yuan, its economic worth is appreciable.

Specific embodiments of the invention are as described below:

Agitator is being housed; widely different flow condenser; in 1000 milliliters of three mouthfuls of reaction flasks of thermometer and dropping funnel; add 340 gram thick laccols (with acetone or alcohol or methylbenzene extraction) and 230 gram epoxy chloropropane; start stirring; the aqueous sodium hydroxide solution that under 40 ℃, adds 160 milliliter 50% by dropping funnel; keep temperature of reaction between 50～70 ℃; after alkali finishes temperature of reaction is controlled at 80～95 ℃; widely different stream stopped stirring heating in 1 hour then; treat after the system cooling upper solution to be poured in the separating funnel; wash underpressure distillation to the neutrality (logical nitrogen protection) with water to remove unreacted epoxy chloropropane and water, obtain 350 gram laccol glycidyl ethers performed polymers.

In the there-necked flask that thermometer, agitator, dropping funnel are housed, add 50 above-mentioned performed polymers of gram and 20 gram anhydrous sodium carbonate powder.Stirring makes its dispersion, adds 90 milliliters of Peracetic Acid (content 18%).Keep being reflected at 20～30 ℃, after two and a half hours product is changed in the separating funnel.Be washed till neutrality with distilled water again after washing twice with 1% aqueous sodium carbonate, underpressure distillation obtains the transparent thick liquid of incarnadine after removing acetate, water and other organic solvent under nitrogen protection then.

Above-mentioned modification performed polymer can add tung oil or other polyunsaturated vegetable oil, and its method of modifying is similar to the reaction of above-mentioned laccol glycidyl ethers performed polymer and Peracetic Acid.

The modification laccol adds the solidifying agent Tetra hydro Phthalic anhydride and tolylene diisocyanate makes its curing.

Claims (5)

1, the light color of raw lacquer and broken colour method of modifying, feature of the present invention is: its chemical modification in two steps, the first step is with the laccol epoxidation or with other active group of going up hydroxyl, second step was to make unsaturated fatty chain also become the modified active functional group gained performed polymer and peroxy acid reaction, and the modification laccol can add additive; The curing mode of remodeling laccol can be a self-drying type, also can be drying-type, and can add solidifying agent or siccative.

2,, it is characterized in that laccol and epichlorohydrin reaction obtain the modification laccol performed polymer of light color by the first step of the described chemical modification of claim 1.

3,, it is characterized in that the reaction of modification laccol performed polymer and Peracetic Acid obtains containing the modification laccol of multiple functional group by second step of the described chemical modification of claim 1.

4, the additive by the described modification laccol of claim 1 is modified tung oil or other modified vegetable oil.

5, by described solidifying agent of claim 1 or siccative be: the combination of two amines, T31 epoxy resin, phthalic acid, maleic anhydride, toluene two different chlorates, toluene diisocyanate resin, aminoresin or these materials.