阅读说明：本技术 一种基于可再生植物沥青的水性生物基醇酸乳液及制备方法 (Water-based bio-based alkyd emulsion based on renewable plant asphalt and preparation method thereof ) 是由 陈安强 郭雯 汪延茂 杨鹏刚 王军强 刘浪浪 邵海龙 来耀东 徐涛 于 2021-10-19 设计创作，主要内容包括：本发明公开了一种基于可再生植物沥青的水性生物基醇酸乳液及制备方法,其采用植物油加工废料植物沥青为主要材料,辅以亚麻油、甘油、二聚酸可再生原料,通过对植物沥青、亚麻油先混合醇解、后酯化缩合聚合工艺,制备出固体分达92％以上的基础醇酸树脂。再利用水性无皂醇酸乳液合成工艺,制备出环保型水性生物基醇酸乳液,其生物基含量占乳液固体分48％以上,并实现了可再生植物沥青的循环利用,大大降低了乳液原材料对石化资源的依赖,具有绿色环保、节约资源等显著特点。用其制备的水性醇酸底漆、水性底面合一防腐漆具有高附着力、高硬度、干性快、耐盐水及耐盐雾性能好等特点,且水性漆VOC不高于94g/L,远低于国家标准的300g/L,环保性能突出。(The invention discloses a water-based bio-based alkyd emulsion based on renewable vegetable pitch and a preparation method thereof, wherein vegetable oil processing waste vegetable pitch is adopted as a main material, linseed oil, glycerol and dimer acid renewable raw materials are supplemented, and a basic alkyd resin with the solid content of more than 92% is prepared by mixing and alcoholysis and post-esterification condensation polymerization processes of the vegetable pitch and the linseed oil. And the environment-friendly water-based bio-based alkyd emulsion is prepared by utilizing a water-based soap-free alkyd emulsion synthesis process, the bio-based content of the environment-friendly water-based bio-based alkyd emulsion accounts for more than 48% of the solid content of the emulsion, the recycling of renewable plant asphalt is realized, the dependence of emulsion raw materials on petrochemical resources is greatly reduced, and the environment-friendly water-based bio-based alkyd emulsion has the remarkable characteristics of environmental friendliness, resource saving and the like. The water-based alkyd primer and water-based primer-topcoat combined anticorrosive paint prepared by the paint has the characteristics of high adhesive force, high hardness, high drying speed, good salt water and salt mist resistance and the like, and the VOC (volatile organic compound) of the water-based paint is not higher than 94g/L and far lower than 300g/L of the national standard, so that the environment-friendly performance is outstanding.)

1. The water-based bio-based alkyd emulsion based on renewable vegetable asphalt is characterized by comprising the following raw materials in percentage by mass:

2. the waterborne bio-based alkyd emulsion based on renewable vegetable asphalt of claim 1, wherein the vegetable asphalt is the waste after vegetable oil processing and refining, and the iodine value is greater than or equal to 70gI/100 g.

3. The renewable vegetable pitch-based aqueous biobased alkyd emulsion of claim 1, wherein said chain transfer solvent is polymethoxy dimethyl ether and propylene glycol butyl ether in a mass ratio (1.5-3.8): (1.5-3.2).

4. The renewable vegetable pitch-based aqueous biobased alkyd emulsion of claim 1, characterized in that said acrylate hybrid monomer is styrene, methyl methacrylate, isooctyl acrylate, methacrylic acid, and hydroxyethyl acrylate in a mass ratio (1.4-5.5): (2.6-5.5): (1.4-2.8): (2.2-2.7): (0.6-1.1) and mixing.

5. The renewable vegetable pitch-based aqueous biobased alkyd emulsion of claim 1, wherein said initiator is one or more of benzoyl peroxide, t-butyl hydroperoxide, and t-butyl peroxybenzoate.

6. The renewable vegetable pitch-based aqueous biobased alkyd emulsion of claim 1, wherein the neutralizing agent is one of dimethylethanolamine, triethylamine or 2-amino-2-methylpropanol.

7. A method for preparing an aqueous biobased alkyd emulsion based on renewable vegetable pitch according to any of claims 1 to 6, comprising the following steps:

step 1: mixing the plant asphalt, the linseed oil, the glycerol and the lithium hydroxide according to the mass percentage, stirring and heating up, and keeping the temperature until alcoholysis and partial esterification are completed to obtain a product A;

step 2: cooling the product A to below 180 ℃, adding dimer acid, phthalic anhydride and a reflux solvent, heating, carrying out heat preservation and reflux to a set acid value, evaporating the reflux solvent, and cooling to obtain a basic alkyd resin;

and step 3: adding a chain transfer solvent into the basic alkyd resin, stirring and slowly heating, dissolving an initiator into an acrylate mixed monomer, adding the mixture into a reaction kettle at a constant speed within a set time, and heating and preserving heat after the reaction is finished to obtain a product B;

and 4, step 4: and cooling the product B, adding a neutralizing agent for neutralization, adding deionized water for emulsification in a high-speed dispersion state, cooling, filtering, packaging and warehousing.

8. The method for preparing the waterborne bio-based alkyd emulsion based on renewable vegetable pitch as in claim 7, wherein in step 1, the temperature is raised to 240-242 ℃ under stirring for 2 hours until alcoholysis and partial esterification are completed.

9. The preparation method of the renewable vegetable asphalt-based waterborne bio-based alkyd emulsion as claimed in claim 7, wherein in step 2, the temperature is raised to 220-225 ℃, and the reflux is carried out under the condition of heat preservation until the acid value is less than or equal to 20 mgKOH/g.

10. The preparation method of the renewable vegetable asphalt-based waterborne bio-based alkyd emulsion as claimed in claim 7, wherein in step 3, the temperature is slowly raised to 125-128 ℃ under stirring, the initiator is dissolved in the acrylate mixed monomer, the acrylate mixed monomer is added into the reaction kettle at a constant speed within 3 hours, and after the reaction is completed, the temperature is raised to 130-132 ℃ and the temperature is maintained for 1-2 hours;

and 4, cooling to below 70 ℃, and adding a neutralizing agent for neutralization for 1 hour.

Technical Field

The invention relates to the technical field of chemical high polymer material synthesis, in particular to a synthesis process of an environment-friendly aqueous biological alcohol emulsion.

Background

In recent years, with the national 'ecological civilization construction', 'adherence to resource saving and environmental protection', etc. into the basic national policy and the continuous enhancement of the environmental awareness of people, laws and regulations related to environmental pollution restrictions are proposed successively in various countries in the world. China pays consumption taxes to the coating industry in 2015 and 2 months, pays environmental protection taxes in 2018, and the like, the traditional solvent-based alkyd resin and coating have high yield, the used organic solvent amount is large and approximately accounts for more than 50% of the resin amount, the organic solvents are discharged into the atmosphere in the manufacturing, processing and construction stages of the coating, not only can cause the change of atmospheric oxidation capacity and acidity (causing acid rain), but also can generate photochemical smog to pollute the environment, most of the organic solvents occur in human settlement areas such as towns and the like, and the harm effect on human health is very serious. Therefore, the production and use of solvent-based coatings are increasingly restricted, and the development of water-based coatings, especially water-based alkyd resins and coatings, is one of the important research directions in the coating industry.

The plant asphalt is residue of vegetable oil soap horn after saponification, acidolysis and rectification to separate various fatty acids, has high boiling point and deep color, and is analyzed by an infrared spectrogram, a gas chromatography-mass spectrometry spectrogram and a nuclear magnetic resonance spectrogram, and the components of the plant asphalt mainly comprise unsaturated fatty acid, saturated fatty acid, grease, sterol, tocopherol, lignin, colloidal substances and the like, and are very complex. At present, the plant asphalt is mainly used as a heavy oil filler to be burnt and used in the fields of casting adhesives, waterproof asphalt and the like, the yield of domestic plant oil is about 3900 ten thousand tons in 2010, the yield of plant asphalt is about 117-195 ten thousand tons per year, the plant asphalt has complex components and uneven quality due to wide distribution of plant oil raw materials, the plant asphalt is used in the field of synthesis of high polymer resin materials with great technical difficulty, and the technical breakthrough and the effective popularization and application in the fields of anticorrosive coatings and water-based resins are not realized all the time.

Disclosure of Invention

In order to realize the technical field of introducing the plant asphalt into the synthesis of the waterborne alkyd resin for the first time, the invention provides the waterborne bio-based alkyd emulsion based on the renewable plant asphalt and the preparation method thereof, wherein the bio-based content of the waterborne bio-based alkyd emulsion accounts for more than 48 percent of the solid content of the emulsion, and the dependence of the emulsion raw material on petrochemical resources is greatly reduced. The water-based alkyd primer and primer-primer combined water-based alkyd paint prepared by the method has the characteristics of high adhesive force, high hardness, quick drying, good salt water and salt mist resistance and the like, and is expected to have a wide application prospect.

Another object of the present invention is to provide a method for preparing the above aqueous alkyd emulsion.

The technical problem to be solved by the invention is realized by the following technical scheme:

the water-based bio-based alkyd emulsion based on the renewable vegetable asphalt comprises the following raw materials in percentage by mass:

the plant asphalt is the waste after the processing and refining of the plant oil, and the iodine value is more than or equal to 70gI/100 g.

The chain transfer solvent is polyoxymethylene dimethyl ether and propylene glycol butyl ether according to the mass ratio (1.5-3.8): (1.5-3.2).

The acrylate mixed monomer is prepared from styrene, methyl methacrylate, isooctyl acrylate, methacrylic acid and hydroxyethyl acrylate according to the mass ratio (1.4-5.5): (2.6-5.5): (1.4-2.8): (2.2-2.7): (0.6-1.1) and mixing.

The initiator is one or more of benzoyl peroxide, tert-butyl hydroperoxide and tert-butyl peroxybenzoate.

The neutralizing agent is one of dimethylethanolamine, triethylamine or 2-amino-2-methylpropanol.

The invention further provides a preparation method of the waterborne bio-based alkyd emulsion based on the renewable vegetable pitch, which comprises the following steps:

step 1: mixing the plant asphalt, the linseed oil, the glycerol and the lithium hydroxide according to the mass percentage, stirring and heating up, and keeping the temperature until alcoholysis and partial esterification are completed to obtain a product A;

step 2: cooling the product A to below 180 ℃, adding dimer acid, phthalic anhydride and a reflux solvent, heating, carrying out heat preservation and reflux to a set acid value, evaporating the reflux solvent, and cooling to obtain a basic alkyd resin;

and step 3: adding a chain transfer solvent into the basic alkyd resin, stirring and slowly heating, dissolving an initiator into an acrylate mixed monomer, adding the mixture into a reaction kettle at a constant speed within a set time, and heating and preserving heat after the reaction is finished to obtain a product B;

and 4, step 4: and cooling the product B, adding a neutralizing agent for neutralization, adding deionized water for emulsification in a high-speed dispersion state, cooling, filtering, packaging and warehousing.

The invention has the advantages and beneficial effects that:

the invention provides a water-based bio-based alkyd emulsion based on renewable vegetable pitch and a preparation method thereof, wherein vegetable oil processing waste vegetable pitch is used as a main material, linseed oil, glycerol and dimer acid renewable raw materials are used as auxiliary materials, and a basic alkyd resin with the solid content of more than 92% is prepared by mixing and alcoholysis and post-esterification condensation polymerization processes of the vegetable pitch and the linseed oil. And then the water-based soap-free alkyd emulsion is prepared by using a water-based soap-free alkyd emulsion synthesis process, wherein the bio-based content of the water-based soap-free alkyd emulsion accounts for more than 48% of the emulsion solid content, so that the dependence of emulsion raw materials on petrochemical resources is greatly reduced, and the water-based soap-free alkyd emulsion has the remarkable characteristics of environmental friendliness, resource saving and the like. The water-based alkyd primer and primer-primer combined water-based alkyd paint prepared by the paint has the characteristics of high adhesive force, high hardness, high drying speed, good salt water and salt mist resistance and the like, and has the VOC (volatile organic compounds) not higher than 94g/L, outstanding environmental protection performance and expected wide application prospect.

Detailed Description

The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention in any way.

The invention relates to a process for synthesizing an aqueous biological alcohol emulsion based on renewable plant asphalt, which comprises the following steps:

step 1: accurately measuring 4-10% of plant asphalt, 5-10% of linseed oil, 3-4% of glycerol and 0.007-0.008% of lithium hydroxide according to the mass percent, then putting the measured materials into a synthesis reaction kettle, stirring and heating the materials to 240-242 ℃, and preserving the heat for 2 hours until alcoholysis and partial esterification are completed to obtain a product A;

the plant asphalt is the waste after the processing and refining of the plant oil, and the iodine value is more than or equal to 70gI/100 g.

Step 2: cooling the product A to below 180 ℃, adding 2-4% of dimer acid, 2-5% of phthalic anhydride and reflux solvent, heating to 220-225 ℃, preserving heat and refluxing until the acid value is less than or equal to 20mgKOH/g, evaporating the reflux solvent, cooling to obtain basic alkyd resin with the solid content of more than 92% for later use;

and step 3: adding 3-7% of chain transfer solvent into basic alkyd resin, putting the basic alkyd resin into a synthesis reaction kettle, stirring and slowly heating to 125-128 ℃, dissolving 0.6-0.9% of initiator into 11-15% of acrylate mixed monomer, adding the mixture into the reaction kettle at a constant speed within 3 hours, heating to 130-132 ℃ after the reaction is finished, and keeping the temperature for 1-2 hours to obtain a product B;

the chain transfer solvent is polyoxymethylene dimethyl ether and propylene glycol butyl ether according to the mass ratio (1.5-3.8): (1.5-3.2) Mixed solvent

The initiator is one or more of benzoyl peroxide, tert-butyl hydroperoxide and tert-butyl peroxybenzoate.

The acrylate mixed monomer is styrene, methyl methacrylate, isooctyl acrylate, methacrylic acid and hydroxyethyl acrylate according to the mass ratio (1.4-5.5): (2.6-5.5): (1.4-2.8): (2.2-2.7): (0.6-1.1) and mixing.

And 4, step 4: and cooling the product B to below 70 ℃, adding 3.1-4.0% of neutralizing agent for neutralization for 1 hour, adding 47.5-50.4% of deionized water for emulsification in a high-speed dispersion state, cooling to below 45 ℃, filtering, packaging and warehousing.

The neutralizing agent in the invention is one of dimethylethanolamine, triethylamine or 2-amino-2-methylpropanol.

Specific examples are given below to further illustrate the present invention.

Example 1

The formula and the synthesis process of the waterborne bio-based alkyd emulsion based on the renewable vegetable pitch are as follows:

the formula is as follows: 9.5% of plant asphalt, 5.5% of linseed oil, 3.3% of glycerol, 0.008% of lithium hydroxide, 4% of dimer acid, 2.4% of phthalic anhydride, 3.7% of polymethoxy dimethyl ether, 1.5% of propylene glycol butyl ether, 3.1% of methyl methacrylate, 1.5% of isooctyl acrylate, 4.5% of styrene, 0.8% of hydroxyethyl acrylate, 2.2% of methacrylic acid, 0.4% of benzoyl peroxide, 0.2% of tert-butyl hydroperoxide, 3.1% of dimethylethanolamine and 49% of deionized water.

The synthesis process comprises the following steps: weighing plant asphalt, linseed oil, glycerol and lithium hydroxide according to the formula amount, adding the weighed materials into a synthesis reaction kettle, starting stirring, heating to 242 ℃, keeping the temperature for 2 hours until alcoholysis is completed, cooling to 180 ℃, adding dimer acid, phthalic anhydride and reflux solvent, heating to 225 ℃, keeping the temperature, refluxing to be qualified, evaporating the reflux solvent, and cooling to below 200 ℃ to obtain a base alkyd resin with the solid content of 93%; adding polymethoxy dimethyl ether and propylene glycol butyl ether, stirring uniformly, cooling to 125 ℃, uniformly mixing and dropwise adding methyl methacrylate, isooctyl acrylate, styrene, hydroxyethyl acrylate, methacrylic acid, benzoyl peroxide and tert-butyl hydroperoxide into a reaction kettle, adding for 3 hours, heating to 132 ℃ after dropwise adding, keeping the temperature for 1 hour, cooling to 70 ℃, adding dimethylethanolamine, and finally adding deionized water to obtain the water-based alkyd emulsion through high-speed dispersion.

Technical indices of the aqueous biobased alcoholic emulsion prepared according to example 1 are shown in the following table:

the results of the gray waterborne alkyd primer test prepared using the waterborne biobased alkyd emulsion synthesized in example 1 are shown in the following table:

example 2

The formula and the synthesis process of the waterborne bio-based alkyd emulsion based on the renewable vegetable pitch are as follows:

the formula is as follows: 6.5% of plant asphalt, 7.5% of linseed oil, 3.2% of glycerol, 0.008% of lithium hydroxide, 2.2% of dimer acid, 4.4% of phthalic anhydride, 1.5% of polymethoxy dimethyl ether, 2% of propylene glycol butyl ether, 2.6% of methyl methacrylate, 2.5% of isooctyl acrylate, 4.5% of styrene, 0.8% of hydroxyethyl acrylate, 2.3% of methacrylic acid, 0.7% of benzoyl peroxide, 3.2% of dimethylethanolamine and 48.5% of deionized water.

The synthesis process comprises the following steps: weighing plant asphalt, linseed oil, glycerol and lithium hydroxide according to the formula amount, adding the weighed materials into a synthesis reaction kettle, starting stirring, heating to 240 ℃, preserving heat for 2 hours until alcoholysis is completed, cooling to 180 ℃, adding dimer acid, phthalic anhydride, petroleum resin and reflux solvent, heating to 220 ℃, preserving heat, refluxing to be qualified, evaporating the reflux solvent, and cooling to below 200 ℃ to obtain basic alkyd resin with the solid content of 95%; adding polymethoxy dimethyl ether and propylene glycol butyl ether, stirring uniformly, cooling to 128 ℃, uniformly mixing methyl methacrylate, isooctyl acrylate, styrene, hydroxyethyl acrylate, methacrylic acid and benzoyl peroxide, dropwise adding into a reaction kettle, adding for 3 hours, heating to 130 ℃ after dropwise adding, keeping the temperature for 2 hours, cooling to 70 ℃, adding dimethylethanolamine, and finally adding deionized water to obtain the water-based alkyd emulsion through high-speed dispersion.

Technical indices of the aqueous biobased alcoholic emulsion prepared according to example 2 are shown in the following table:

the results of the iron red waterborne alkyd primer test prepared using the aqueous bio-based emulsion of alcohol as synthesized in example 2 are shown in the following table:

example 3

The formula and the synthesis process of the waterborne bio-based alkyd emulsion based on the renewable vegetable pitch are as follows:

the formula is as follows: 8.5% of plant asphalt, 9.7% of linseed oil, 3.2% of glycerol, 0.008% of lithium hydroxide, 2% of dimer acid, 3.4% of phthalic anhydride, 3.1% of polymethoxy dimethyl ether, 3.2% of propylene glycol butyl ether, 5.5% of methyl methacrylate, 1.8% of isooctyl acrylate, 1.5% of styrene, 0.7% of hydroxyethyl acrylate, 2.4% of methacrylic acid, 0.7% of benzoyl peroxide, 3.5% of triethylamine and 50.4% of deionized water.

The synthesis process comprises the following steps: weighing plant asphalt, linseed oil, glycerol and lithium hydroxide according to the formula amount, adding the weighed materials into a synthesis reaction kettle, starting stirring, heating to 241 ℃, preserving heat for 2 hours until alcoholysis is completed, cooling to 160 ℃, adding dimer acid, phthalic anhydride, petroleum resin and reflux solvent, heating to 220 ℃, preserving heat, refluxing to be qualified, evaporating the reflux solvent, and cooling to below 200 ℃ to obtain basic alkyd resin with the solid content of 92%; adding polymethoxy dimethyl ether and propylene glycol butyl ether, stirring uniformly, cooling to 127 ℃, uniformly mixing methyl methacrylate, isooctyl acrylate, styrene, hydroxyethyl acrylate, methacrylic acid and benzoyl peroxide, dropwise adding into a reaction kettle, adding for 3 hours, heating to 131 ℃, keeping the temperature for 1 hour after completing dropwise adding, cooling to 70 ℃, adding triethylamine, and finally adding deionized water to disperse at high speed to obtain the water-based alkyd emulsion.

Technical indices of the aqueous biobased alcoholic emulsion prepared according to example 3 are shown in the following table:

the results of the gray-bottom-in-one waterborne alkyd paint prepared using the waterborne bio-based alkyd emulsion synthesized in example 3 are shown in the following table:

example 4

The formula and the synthesis process of the waterborne bio-based alkyd emulsion based on the renewable vegetable pitch are as follows:

the formula is as follows: 4% of plant asphalt, 10% of linseed oil, 4% of glycerol, 0.007% of lithium hydroxide, 3% of dimer acid, 2% of phthalic anhydride, 1.5% of polymethoxy dimethyl ether, 1.5% of propylene glycol butyl ether, 2.9% of methyl methacrylate, 2.8% of isooctyl acrylate, 5.5% of styrene, 1.1% of hydroxyethyl acrylate, 2.7% of methacrylic acid, 0.4% of benzoyl peroxide, 0.4% of tert-butyl peroxybenzoate, 3.7% of 2-amino-2-methyl propanol and 47.5% of deionized water.

The synthesis process comprises the following steps: weighing plant asphalt, linseed oil, glycerol and lithium hydroxide according to the formula amount, adding the weighed materials into a synthesis reaction kettle, starting stirring, heating to 240 ℃, preserving heat for 2 hours until alcoholysis is completed, cooling to 170 ℃, adding dimer acid, phthalic anhydride, petroleum resin and reflux solvent, heating to 225 ℃, preserving heat, refluxing to be qualified, evaporating the reflux solvent, and cooling to below 200 ℃ to obtain basic alkyd resin with the solid content of 95%; adding polymethoxy dimethyl ether and propylene glycol butyl ether, stirring uniformly, cooling to 126 ℃, uniformly mixing and dropwise adding methyl methacrylate, isooctyl acrylate, styrene, hydroxyethyl acrylate, methacrylic acid, benzoyl peroxide and tert-butyl peroxybenzoate into a reaction kettle, adding for 3 hours, heating to 132 ℃ after dropwise adding, keeping the temperature for 1 hour, cooling to 70 ℃, adding 2-amino-2-methyl propanol, and finally adding deionized water to obtain the aqueous alkyd emulsion through high-speed dispersion.

Technical indices of the aqueous biobased alcoholic emulsion prepared according to example 4 are shown in the following table:

the results of the test on the quick-drying iron red waterborne alkyd primer prepared using the waterborne bio-based alkyd emulsion synthesized in example 4 are shown in the following table:

example 5

The formula and the synthesis process of the waterborne bio-based alkyd emulsion based on the renewable vegetable pitch are as follows:

the formula is as follows: 10% of plant asphalt, 5% of linseed oil, 3% of glycerol, 0.007% of lithium hydroxide, 2% of dimer acid, 5% of phthalic anhydride, 3.8% of polymethoxy dimethyl ether, 3.2% of propylene glycol butyl ether, 5.3% of methyl methacrylate, 1.4% of isooctyl acrylate, 1.4% of styrene, 0.6% of hydroxyethyl acrylate, 2.3% of methacrylic acid, 0.9% of benzoyl peroxide, 4.0% of triethylamine and 49.5% of deionized water.

The synthesis process comprises the following steps: weighing plant asphalt, linseed oil, glycerol and lithium hydroxide according to the formula amount, adding the weighed materials into a synthesis reaction kettle, starting stirring, heating to 242 ℃, preserving heat for 2 hours until alcoholysis is completed, cooling to 170 ℃, adding dimer acid, phthalic anhydride, petroleum resin and reflux solvent, heating to 220 ℃, preserving heat, refluxing to be qualified, evaporating the reflux solvent, and cooling to below 200 ℃ to obtain basic alkyd resin with the solid content of 92%; adding polymethoxy dimethyl ether and propylene glycol butyl ether, stirring uniformly, cooling to 125 ℃, uniformly mixing methyl methacrylate, isooctyl acrylate, styrene, hydroxyethyl acrylate, methacrylic acid and benzoyl peroxide, dropwise adding into a reaction kettle, adding for 3 hours, heating to 130 ℃ after dropwise adding, keeping the temperature for 2 hours, cooling to 70 ℃, adding triethylamine, and finally adding deionized water to obtain the aqueous alkyd emulsion through high-speed dispersion.

Technical indices of the aqueous biobased alcoholic emulsion prepared according to example 5 are shown in the following table:

the results of the grey water alkyd primer test prepared using the aqueous bio-based emulsion of alcohol synthesized in example 5 are shown in the following table:

the embodiment shows that the waterborne bio-based alkyd emulsion based on the renewable vegetable pitch has the advantages of high solid content, good emulsion stability, no less than 44% of emulsion solid content, no more than 75g/L of VOC content, and more than 48% of bio-based content, greatly reduces the dependence of emulsion raw materials on petrochemical resources, and has the remarkable characteristics of environmental protection, resource saving and the like. The water-based alkyd primer and the water-based primer-topcoat alkyd paint prepared by using the water-based alkyd emulsion have the characteristics of good mechanical property, good salt spray resistance, quick drying and the like. The VOC content of the water-based paint is not more than 94g/L, the hardness of the paint film is not less than 0.3, the bending is not more than 2mm, the adhesive force cross-cut method is not more than 1 grade, the salt water resistance is not less than 96h, the salt spray resistance is not less than 72h, and the comprehensive performance of the paint film is excellent.

As can be seen from the table, the aqueous biological alcohol-based emulsion prepared by the invention has higher bio-based content and low VOC content, is a green environment-friendly bio-based polymer material which realizes the recycling of renewable resources, and has wide market space and popularization value.

The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.